Monday, October 8, 2012

Surprising Things You Didn't Know About Dogs and Cats

Fact: Dog Kisses Can Make You Sick

Think dogs' mouths are cleaner than humans? Think again. Dogs' chops are teeming with bacteria, and may harbor germs like salmonella and campylobacter. These organisms get into a dog's mouth from eating spoiled food or when he uses his tongue as toilet paper. Then a kiss moves these germs from pooch to person, potentially along with a nasty case of diarrhea.Dog licking man's face.

Fact: Humans Can Make Pets Sick

It's not common, but it happens. H1N1 "swine" flu has hit cats, dogs, and ferrets -- contracted from their sick owners. Most often it's mild, but a few pets have died, so vets advise frequent hand washing and separate beds when the owner is sick. Dogs and people can also share the same strains of E. coli bacteria. And MRSA, the "superbug", can move between humans and dogs.A sneezing woman and dog.

Myth: Cats Steal a Baby's Breath

This superstition goes back to the 1700s. When babies died of sudden infant death syndrome (SIDS), people were quick to blame a cat seen lying in the crib. Today, soft toys, illnesses, a stomach-lying position have all been linked to SIDS — but not cats. Cats are drawn to cribs because they're warm, cozy, elevated places – perfect for a catnap.Baby sleeping with cat.

Fact: Dogs Can Smell Diabetes

It sounds like a Lassie TV episode, but it's truth, not fiction. Dogs can sniff out a dangerous drop in blood sugar in a diabetic owner and alert the person to take action by pawing, licking, whining, or barking. A few dogs have even been trained and placed as diabetic service dogs. Their nose for hypoglycemia (low blood sugar) is correct 90% of the time, according to their trainers.A dog and woman.

Fact: Dogs Have a Look of Love

When your dog locks eyes with you, it may genuinely be a look of love, and not simply a form of begging. Dogs can develop this atypical behavior with close human companions — while between dogs or with a strange person, a direct stare is a threat. Of course not every glance from Fido is loving — he may simply want your dinner. Or, if his body is tense and ears flattened, he may be telling you to back off.A dog on a pink chair.

Fact: Cats May Love Too Much

Behavior experts confirm that some cats really do experience separation anxiety when apart from a favorite person — and that's one reason a sweet kitty may pee on your clothes when you're at work. Other signs: the cat paces, vocalizes, or blocks the owner's path to the door. Left alone, she may vomit or be too worried to eat. For cats who love too much, behavior therapy can help -- along with anti-anxiety medications for severely affected cats.
Kitten at a window.

Fact: Dogs Can Learn 250 Words

The smartest, best-trained breeds are similar to a 2-year-old child in their ability to understand human speech, according to researcher Stanley Coren, PhD. These dogs understand up to 250 words, while the average dog can understand 150 words. Top Dog: Border collie, poodle, German shepherd, golden retriever, Doberman pincher Beauty Before Brains: Borzoi, chow chow, bull dog, basenji, Afghan hound.A girl and a dog.

Fact: White Cats Are Often Deaf

Cats with a white coat are often deaf in one or both ears, especially those with blue eyes. When only one eye is blue, the cat is likely to be deaf on that side only. Many owners report that deaf cats are not too bright — but it's not clear if deafness or lower intelligence is to blame.A cat with blue and green eyes.

Myth: Cats Will Land on Their Feet

Cats are champs at landing feet first over short distances, thanks to a highly flexible backbone. But they do sometimes land on their heads. And beyond one-two stories, their feet cannot "break" the fall. Their heads and bodies collide with the ground, causing severe injuries. Cats with access to an elevated, open window may also focus so intently on a bird, that they lose their balance and fall — called high-rise syndrome.A cat falling.

Fact: Dogs Can Dance

Dog lovers have created a competitive event called canine freestyle that brings the bond between human and animal to a new high. A dog and handler pair up — ballroom dancing style — for a choreographed dance performed with music and, sometimes, matching costumes.A dog dancing.

Fact: Cats Smell With Their Mouths

Cats have a small scent gland in the roof of the mouth called the vomeronasal organ. For a really good whiff of something like urine or another cat's private parts, they'll open their mouths wide to draw the odor to this scent organ. This fierce-looking behavior is called the Flehmen reaction, and it's often seen in males who are checking out a female cat in heat.A cat licking it's chops.

Myth: Tail Wagging, Happy Dog

A dog wags his tail in three very different moods and only one is happy. When it's unusually high and stiff, the dog is agitated and ready to protect his turf. A tail held low and wagged very quickly shows a scared and submissive dog. A happy dog wags his tail in its natural, mid-level position — and his ears, mouth, and body will look relaxed, too.
Photo of two dogs.

Fact: Newborn Pups Don't Wag

Puppies don't wag their tails before they are about three weeks old — and some don't start until seven weeks old. Vets believe tiny puppies are capable, but they're too busy sleeping and eating to bother. As they become more alert, tail wagging starts as a kind of sign language: a peace sign to rambunctious littermates or when begging for food. Dogs almost never wag their tails when alone.Photo of puppy dog.

Fact: Early Bonding Key for Kitty

Cats that are aloof or bite the hand that feeds them probably had no exposure to people in early life. Feline behavior experts say a kitten needs regular contact with people in the first seven weeks, or it may never bond with humans. Even five minutes a day in the early weeks will teach a kitten not to bite when the hand of a towering human lifts it off the ground.Photo of newborn kitten.

Myth: Dogs See in Black and White

Not so, say canine researchers. Dogs see blue, violet, and many more shades of gray than humans. They also see better in low light and can pick up the slightest movement — a trait that makes them good hunters. They probably do not see red, orange, yellow, or green, based on examination of the color-sensitive cone cells in canine retinas.
A dog looking at a crowd.

Myth: Warm Nose, Sick Dog

The temperature of a dog's nose changes easily and is not a good sign of illness. It can be hot and dry after lying in the sun or cool and wet from dipping into the water bowl. Better signs of illness are lethargy, loss of appetite, vomiting, coughing, or a body temperature above 102.5˚F on a rectal thermometer. The wet snout? It comes from ducts that carry tears toward the nose.Photo of a dog's nose.

Fact: A Limp Can Mean Lung Trouble

Dogs sometimes come to the vet for a limp and leave with a diagnosis of lung cancer. Cancer in the chest can activate the leg bones to grow new tissue -- causing swelling and pain in the legs. A more typical symptom of lung cancer is a cough, although about 25% of dogs have no symptoms until cancer is detected on chest X-ray. The leg changes -- called hypertrophic osteopathy -- go away once the cancer is treated.A bassett hound running.

Myth: Cats Need Milk

The long-standing myth that cats need milk is wrong and giving your pet a saucer of cow's milk could make it have diarrhea. Kittens drink their mother's milk until they are weaned and older cats may like the taste of cow's milk. But adult cats don't have much lactase, the enzyme needed to break down the lactose sugar in milk. The result is often uncomfortable and messy: diarrhea.A cat drinking milk.

Myth: Dogs Need Bones

This practice comes from the idea that ancient dogs (wolves) ate plenty of bones. Today, pet dogs can get all the calcium and nutrients they need from dry kibble. Bones do satisfy the intense canine chewing instinct, but they can choke a dog or splinter into knife-like shards, even when cooked. Edible chewies or sturdy rubber chew toys from the store are a safer choice.A dog straining toward a steak bone.

Myth: Licking Heals Dogs' Wounds

There is no magic healing power in dog saliva, contrary to popular belief. Quite the opposite: mouth bacteria may cause infection that delays healing. Dogs are also prone to compulsive licking, which can result in persistent sores, called acral lick dermatitis. The healing choice is usually an Elizabethan collar that blocks his tongue from reaching a sore until it's completely healed.A dog with a cone around neck.

Fact: Cats Kiss With Their Eyes

Cats communicate with a slow blink, according to feline experts. With their own kind, it's a peace sign, meant to put other felines at ease. Aimed at a human, this seductive blink shows affection, even love. People can return the love with a long gaze and slow blink to "blow a kiss" back in cat body language. The calming blink works on house cats, feral cats, and even tigers in the wild, according to behaviorist Roger Tabor.Green-eyed cat.

Fact: Dogs Fall in Love

Can two dogs develop a loving relationship? Or do they hook up with anyone at the dog park? Anthropologist Elizabeth Marshall Thomas says dogs can fall in love and she documents a remarkable love story between "Sundog" and "Bean" in her book, "The Social Lives of Dogs." Thomas claims few dogs develop relationships because they are kept as pets in captivity, "born to do what we want, not what they want."
Dogs kissing.

Fact: Smoking Kills Cats and Dogs

Secondhand smoke increases the risk of at least two fatal cancers in cats: lymphoma and oral carcinoma. Housecats get a double dose of toxins by breathing cigarette smoke in the air and by licking the residue off their fur when grooming. Dogs with long noses may develop cancerous nasal tumors from living with a smoker -- and short-nosed breeds are more prone to lung cancer.Smoke and a dog.

Cat Language: Purring Through Pain

The quiet, motor-like sound of a purring cat is not yet well understood. Every cat fancier has seen their pet purring in happiness; yet cats also purr when they are in pain or close to death. It may be a self-soothing behavior. Kittens begin purring within hours of birth as they nurse — and the mother cat purrs during feeding sessions, too.
Mama and kittrn cats.

Cat Language: Chirping

Cats make this sharp, high-pitched sound when highly aroused by the sight of prey, such as the animal more commonly known for chirping, the bird. When a cat is blocked from getting at the prey, he may chatter — a throaty vocalization accompanied by quick movements of the lower jaw.A cat stalking a bird.

Dog Language: Grin and Bear It

Owners who insist their dogs can smile are correct in thinking that the canine mouth can show emotions. Relaxed and open, it can be a sign of a happy dog. A submissive grin is a canine version of our nervous smile. Dogs pull their lips up, show their front teeth, and may crouch. This harmless, nervous "grin" is easily confused with an aggressive snarl. When in doubt, don't mess with the dog.A dog snarling.

Prostate Cancer

What Is Prostate Cancer?

Prostate cancer develops in a man's prostate, the walnut-sized gland just below the bladder that produces some of the fluid in semen. It's the most common cancer in men after skin cancer. Prostate cancer often grows very slowly and may not cause significant harm. But some types are more aggressive and can spread quickly without treatment.
Photo of prostate diagram.


Symptoms of Prostate Cancer

In the early stages, men may have no symptoms. Later, symptoms can include:
  • Frequent urination, especially at night
  • Difficulty starting or stopping urination
  • Weak or interrupted urinary stream
  • Painful or burning sensation during urination or ejaculation
  • Blood in urine or semen
Advanced cancer can cause deep pain in the lower back, hips, or upper thighs.Photo of man in hallway.

Enlarged Prostate or Prostate Cancer?

The prostate can grow larger as men age, sometimes pressing on the bladder or urethra and causing symptoms similar to prostate cancer. This is called benign prostatic hyperplasia (BPH). It's not cancer and can be treated if symptoms become bothersome. A third problem that can cause urinary symptoms is prostatitis. This inflammation or infection may also cause a fever and in many cases is treated with medicine.Photo of an enlarged prostate.

Risk Factors You Can't Control

Growing older is the greatest risk factor for prostate cancer, particularly after age 50. After 70, studies suggest that most men have some form of prostate cancer, though there may be no outward symptoms. Family history increases a man's risk: having a father or brother with prostate cancer doubles the risk. African-Americans are at high risk and have the highest rate of prostate cancer in the world.Photo of men golfing.

Risk Factors You Can Control

Diet seems to play a role in the development of prostate cancer, which is much more common in countries where meat and high-fat dairy are mainstays. The reason for this link is unclear. Dietary fat, particularly animal fat from red meat, may boost male hormone levels. And this may fuel the growth of cancerous prostate cells. A diet too low in fruits and vegetables may also play a role.Photo of a slice of pizza.

Myths About Prostate Cancer

Here are some things that will not cause prostate cancer: Too much sex, a vasectomy, and masturbation. If you have an enlarged prostate (BPH), that does not mean you are at greater risk of developing prostate cancer. Researchers are still studying whether alcohol use, STDs, or prostatitis play a role in the development of prostate cancer.
Photo of couple in a convertible.

Can Prostate Cancer Be Found Early?

Screening tests are available to find prostate cancer early, but government guidelines don't call for routine testing in men at any age. The tests may find cancers that are so slow-growing that medical treatments would offer no benefit. And the treatments themselves can have serious side effects. The American Cancer Society advises men to talk with a doctor about screening tests, beginning at:
  • 50 for average-risk men who expect to live at least 10 more years.
  • 45 for men at high risk. This includes African-Americans and those with a father, brother, or son diagnosed before age 65.
  • 40 for men with more than one first-degree relative diagnosed at an early age.Photo of man on exam table.

    Screening: DRE and PSA

    Your doctor may initially do a digital rectal exam (DRE) to feel for bumps or hard spots on the prostate. After a discussion with your doctor, a blood test can be used to measure prostate-specific antigen (PSA), a protein produced by prostate cells. An elevated level may indicate a higher chance that you have cancer, but you can have a high level and still be cancer-free. It is also possible to have a normal PSA and have prostate cancer.Photo of DRE exam.

    PSA Test Results

    A normal PSA level is considered to be under 4 nanograms per milliliter (ng/mL) of blood, while a PSA above 10 suggests a high risk of cancer. But there are many exceptions:
  • Men can have prostate cancer with a PSA less than 4.
  • A prostate that is inflamed (prostatitis) or enlarged (BPH) can boost PSA levels, yet further testing may show no evidence of cancer.
  • Some BPH drugs can lower PSA levels, despite the presence of prostate cancer, called a false negative.
If either your PSA or DRE are abnormal, your doctor will order other tests.Photo of blood sample.

Prostate Cancer Biopsy

If a physical exam or PSA test suggests a problem, your doctor may recommend a biopsy. A needle is inserted either through the rectum wall or the skin between the rectum and scrotum. Multiple small tissue samples are removed and examined under a microscope. A biopsy is the best way to detect cancer and predict whether it is slow-growing or aggressive.Photo of prostate biopsy.

Biopsy and Gleason Score

A pathologist looks for cell abnormalities and "grades" the tissue sample from 1 to 5. The sum of 2 Gleason grades is the Gleason score. These scores help determine the chances of the cancer spreading. They range from 2, less aggressive, to 10, a very aggressive cancer. Gleason scores helps guide the type of treatment your doctor will recommend.
Photo of gleason diagram.

Prostate Cancer Imaging

Some men may need additional tests to see if the cancer has spread beyond the prostate. These can include ultrasound, a CT scan, or an MRI scan (seen here). A radionuclide bone scan traces an injection of low-level radioactive material to help detect cancer that has spread to the bone.
In the MRI scan shown here, the tumor is the green, kidney-shaped mass in the center, next to the prostate gland (in pink).
MRI of prostate cancer.

Prostate Cancer Staging

Staging is used to describe how far prostate cancer has spread (metastasized) and to help determine the best treatment.
  • Stage I: Cancer is small and still within the prostate.
  • Stage II: Cancer is more advanced, but still confined to the prostate.
  • Stage III: Cancer has spread to the outer part of the prostate and nearby seminal vesicles.
  • Stage IV: Cancer has spread to lymph nodes, nearby organs or tissues such as bladder or rectum, or distant organs such as bones or lungs.Photo of stages of prostate cancer.

    Prostate Cancer Survival Rates

    The good news about prostate cancer is that it usually grows slowly. And 9 out of 10 cases are found in the early stages. Overall, the 5-year relative survival rate is 100% for men with disease confined to the prostate or nearby tissues, and many men live much longer. When the disease has spread to distant areas, that figure drops to 31%. But these numbers are based on men diagnosed at least 5 years ago. The outlook may be better for men diagnosed and treated today.Photo of grandfather and grandson.

    Treatment: Watchful Waiting

    With low-risk cancer, one option is to watch and wait. This is determined by your biopsy, PSA test, and Gleason scores. Your doctor will order periodic testing. Other treatments – with the risk of sexual or urinary problems – may not be necessary. Some men who are older or have serious health conditions may not need treatment. However, more aggressive treatment is usually recommended for younger men or those with more aggressive disease.
    Photo of doctor discussing prostate exam results.

    Treatment: Radiation Therapy

    External beam radiation to kill cancer cells can be used as a first treatment or after prostate cancer surgery. It can also help relieve bone pain from the spread of cancer. In brachytherapy, tiny radioactive pellets about the size of a grain of rice are inserted into the prostate. Both methods can impair erectile function. Fatigue, urinary problems, and diarrhea are other possible side effects.Photo of CT scan of pelvis.

    Treatment: Surgery

    Removing the prostate, or radical prostatectomy, is used to eliminate the cancer when it is confined to the prostate. New techniques use smaller incisions and seek to avoid damaging nearby nerves. If lymph nodes are also cancerous, prostatectomy may not be the best option. Surgery may impair urinary and sexual function, but both can improve over time.Photo of prostate cancer surgery.

    Treatment: Hormone Therapy

    Hormone therapy may shrink or slow the growth of your cancer, but unless it is used with another therapy it will not eliminate the cancer. Drugs or hormones block or stop the production of testosterone and other male hormones, called androgens. Side effects can include hot flashes, growth of breast tissue, weight gain, and impotence.Photo of syringe with droplet.

    Treatment: Chemotherapy

    Chemotherapy kills cancer cells throughout the body, including those outside the prostate, so it is used to treat more advanced cancer and cancer that did not respond to hormone therapy. Treatment is usually intravenous and is given in cycles lasting 3-6 months. Because the chemotherapy kills other fast-growing cells in the body, you may have hair loss and mouth sores. Other side effects include nausea, vomiting, and fatigue.Photo of chemotherapy treatment.

    Treatment: Cryotherapy

    Cryotherapy freezes and kills cancerous cells within the prostate (like the highly magnified cells shown here.) It is not as widely used because little is known about its long-term effectiveness. It's less invasive than surgery, with a shorter recovery time. Because the freezing damages nerves, as many as 80% of men become impotent after cryosurgery. There can be temporary pain and burning sensations in the bladder and bowel.Photo of prostate cancer cells.

    Treatment: Prostate Cancer Vaccine

    This vaccine is designed to treat, not prevent, prostate cancer by spurring your body's immune system to attack prostate cancer cells. Immune cells are removed from your blood, activated to fight cancer, and infused back into your blood. Three cycles occur in one month. It's used for advanced prostate cancer that no longer responds to hormone therapy. Mild side-effects can occur such as fatigue, nausea, and fever.
    Photo of prostate cancer vaccine.

    Hope for Advanced Cancer

    Your doctor will continue to monitor your PSA levels and may perform other tests after treatment for prostate cancer. If it recurs or spreads to other parts of the body, additional treatment may be recommended. Lifestyle choices may matter, too. One study found that prostate cancer survivors who exercised regularly had a lower risk of dying.Photo of grandfather walking with grandson.

    Coping With Erectile Dysfunction

    Erectile dysfunction is a common side effect of prostate cancer treatments. Generally, erectile function improves within two years after surgery. Improvement may be better for younger men than for those over 70. You also may benefit from ED medications. Other treatments, such as injection therapy and vacuum devices, may help.Photo of holding hands.

    Food for Health

    A cancer-conscious diet may be the best choice for survivors who want to bolster their health and those hoping to lower their risk. That means:
  • Five or more fruits and veggies a day
  • Whole grains instead of white flour or white rice
  • Limit high-fat meat
  • Limit or eliminate processed meat (hot dogs, cold cuts, bacon)
  • Limit alcohol to 1-2 drinks per day (if you drink)
Foods high in folate may have some action against prostate cancer (spinach, orange juice, lentils). Studies found mixed results on lycopene, an antioxidant found in tomatoes.Photo of lentils and spinach.

Supplements: Buyer Beware

Be wary of supplements that are marketed to prevent prostate cancer. Some herbal substances can interfere with PSA levels. A 10-year study showed an increase in the risk of cancer for men who took folic acid supplements. A 5-year study of selenium and vitamin E did not show a decreased risk of prostate cancer. Be sure to tell your doctor if you are taking vitamins or supplements.Photo of supplement pills.