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San Bruno Pet Hospital 1111 El Camino Real
San Bruno, CA 94066
Phone: (650) 583-5039
Fax: (650) 763-8620

Hospital Hours
M-F: 7:30a-6p
Sat: 8a-5p
Appointment Hours
M-F 8:30a-5:30p
Sat: 8:30a-4:30p

After Hours Emergency
Emergency Clinic


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NOTE: These are offered
as general information
only and NOT a substitute
for a visit to your
veterinarian. If you feel
that your pet has a
problem that may require
urgent attention
call us at (650) 583-5039
immediately. If after hours,
contact the emergency
clinic (650) 348-2575.
Signs Your Cat May Be Sick
If you have any questions or concerns, you should always visit or call San Bruno Pet - we are your best resource to ensure the health and well-being of your pets.

Sometimes good, concerned, caring owners just don't notice very early or subtle hints of illness in a cat. Why is it so tough to identify those signs? Possibly because cats have kept the ability to hide signs so well, that they sometimes go unnoticed. Remember, when animals act sick in the wild, they get eaten.

Here are 10 signs of illness in cats.

1. Change in Appetite
Eating too much or too little can potentially signify disease. If you notice a change either way, you should call San Bruno Pet. There are countless diseases that can cause overeating or losing one’s appetite. Our job will be to investigate why. This typically starts with blood work, X-rays and/or ultrasound.

2. Stinky Breath
A foul odor coming from your kitty’s mouth can mean gum disease or tooth decay. Brushing your cat’s teeth is a good way to decrease those risks. Imagine if you went 5, 10 or 15 years without brushing your teeth! In addition, breath that smells like ammonia can be a sign of kidney disease.

3. Eliminating Outside of the Litter Box
Causes of this annoying habit can be behavioral or indicate a disease. Discuss your pet’s symptoms with your vet to rule out a bladder infection or urinary blockage before treating this as a behavior issue.

4. Weight Change
Weight loss can be an indication of thyroid disease or worse, cancer. Weight gain or a growing belly can be related to various conditions such as pyometra (a uterus full of pus). Obesity by itself is detrimental to your pet’s health: it can lead to arthritis, tumors and a shorter lifespan.

5. Behavior Change
If your normally social kitty suddenly becomes antisocial, there may be a medical reason. A classic sign of illness is hiding: kitty feels bad, tries to hide from “predators” and hides in a closet or under a bed.

6. Grooming Change
Lack of grooming can cause a dull or greasy hair coat, which can indicate skin disease or other problems. Some cats over-groom and end up with bald patches. Skin parasites, like fleas or mange, or even stress can cause this behavior.

7. Activity Change
A sudden increase in activity level in a middle-aged to older kitty can indicate an overactive thyroid. If your kitty seems less than enthusiastic about moving around or playing, it may indicate arthritis or other issues.

8. Sleep Pattern Change
If your cat seems to sleep all day when he used to be active, he may be trying to tell you he doesn't feel well. The opposite is also true. If your kitty is up all night roaming the house, vocalizing, or seems overactive during the day, there might be an underlying cause.

9. Stress-Induced Behavior
A change in your cat’s routine may be a sign of stress. Changes in the environment your pet lives in, like the addition of another pet, remodeling or loud noises can all cause hiding, depression or a lack of appetite. Be objective and thorough when describing any potential changes to your veterinarian.

10. Voice Change
Voice changes can actually indicate a problem. Normally quiet cats with an increase in vocalizations, or a usually chatty kitty which suddenly becomes quiet, might mean trouble. Any of the above changes, whether slow or quick, should be a reason to take your cat (or dog) to San Bruno Pet to investigate the cause and find a treatment as soon as possible.

By Dr. Phil Zeltzman, DVM, DACVS, CVJ