All the Trivia You Could Ever Hope to Find about CATS! No-Nos!... Declawing a cat is the same as cutting a human's fingers off at the knuckle. Never give your cat aspirin, unless advised to do so by your vet. Aspirin can cause hemorrhaging in the gastorintestinal tract. It can also depress bone marrow activity, which makes red blood cells and may also damage the kidneys. Tylenol and chocolate are both poisonous to cats.  Most cats are unable to properly digest cow's milk. Milk and milk products give them diarrhea.  Onions and its derivatives are bad for your cat. One component of onions, n-propyldisulphide can injure the hemoglobin in feline red blood cells. Blood cells with damaged hemoglobin may develop abnormal structures called Heinz-bodies and be destroyed-potentially leading to a red-blood-cell shortage (anemia). This shouldn't be a problem for most cats, but some of us feed our kitties baby food when they are ill. Check the ingredients on the jar before feeding it to your cat. Some common causes of stress in cats are: The introduction of a new cat, dog or person to the household. The loss of a companion cat, dog or person. A move to a new home. Construction activity in or near the home. A stay in a cattery while an owner is away (or even a cat's return home after a stay in a cattery). A change in the owner's routine (for example, an owner returns to a school-year job after being home for the summer). A change in diet. Many cats would rather eat the same food each day than be "treated" to new tastes and textures in their diet. Don't give kitty raw egg white. Raw egg whites contain an enzyme that breaks down the vitamin biotin, which is essential to cat health. Never pick a kitten up by the neck. Only a mother cat may do this safely.