Common symptoms of canine illnesses include changes in appetite, changes in behavior or personality and vomiting or diarrhea, according to Pet Health Network. Changes in movement, such as difficulty standing or a stiff g... More »

As dogs age and become more susceptible to illness, their ability to function declines. This can affect eyesight, activity level and hearing capability. Memory loss and differences in temperament and awareness are also s... More »

Some common dog illnesses include parvovirus, distemper, kennel cough, adenovirus and leptospirosis. Parvovirus, colloquially called "parvo," is a contagious illness usually striking dogs ages 12 weeks to 3 years old, wi... More »

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Common symptoms of feline illness include changes in litterbox habits, changes in appetite and behavioral changes, such as increased vocalization, according to Pet Health Network. Bad breath may also indicate dental prob... More »

Vomiting or diarrhea, lack of appetite or decreased activity, changes in urination, and coughing are all warning signs of illness in dogs, according to WebMD. Stiffness, lameness and difficulty rising are other warning s... More »

Sudden changes in behavior, bowel movements, appearance and appetite are prime indicators of illness in cats, according to Petfinder. Bad breath can also indicate the development of dental disease or kidney problems, whi... More »

The most common signs of illness in dogs are behavior changes, change in eating or drinking habits, fever, vomiting and diarrhea. Appearance changes can also signal illness. More »

www.reference.com Pets & Animals Pets Veterinary Health