Human: How can I tell if my cat is sick? Assistant: 
Check your cat's behavior for signs of illness such as decreased activity, changes in eating and drinking habits, coughing, vomiting, or changes in litter box habits. 2 Look for changes in her coat such as dullness, loss of fur, or bald patches. 3 Take your cat to the vet if you notice any of these symptoms or if she seems to be in any pain or appears to be unwell.