Krdytkyu

It's been three days since one of my kittens died. And since that day my other cat is not eating or drinking anything. I am afraid that he will get weak and ill. Please suggest to me what to do to make him eat.

Update: The vet said that it may be because my cat is in grief and sad.

If a cat isn't eating it's always time for the veterinarian!

As Trond points out, make sure he is drinking water. And until you can see a vet keep the cat properly warm (not hot, but make sure he isn't cold).

This could be a disease he caught from the other cat, or it could be a severe case of grief, but when a cat isn't eating veterinary intervention is needed urgently!

Not eating properly even for a few days is likely to cause the fatty liver syndrome for a cat, which is usually fatal if left untreated, but has a good recovery rate, if treated early. You should take your cat to a vet immediately for an examination.

Sometimes a cat is more willing to eat if you can feed him things like small pieces of fresh meat from your hand. Adding liquid to his food may help, if you can get him to eat but not drink. Some cats may prefer running water. In any case, you will need to take your cat to a veterinarian immediately, preferably one that is specialized in felines.

EDIT:

Your vet thinks your cat is not eating because of grief. Did you vet offer advice you on how to get him to eat again? A professional should be able to give you the best answers.

A vet may also be able to prescribe medicine for stimulating the appetite of your cat, if you cannot get him to eat even by offering treats. You may need to consider giving him food with a syringe, if nothing else works. Humans can survive a long time without food, but even a few days without food is dangerous for cats.

As the others have said, do involve your veterinarian.

However, any animal that can make a friendship bond, and cats are certainly included, can feel some degree of sadness and grief at the loss of a companion, whether by death or otherwise, and it is not uncommon for pets to experience a kind of depression after a major loss. Make sure to give your cat lots of attention and reassurance; in particular, make it easy for him to be near you physically if he wants to (a nearby box or chair to sit in, able to curl up in your lap or pocket). Cats as a species are less physically affectionate than dogs or ferrets, but especially at this time, he may appreciate extra love.