My older cat hides, won't eat, drinks lots after new kitten. Is it serious?

Congrats on your new kitten, but I'm sorry Eloise isn't doing well. Yes, I would be very concerned that she isn't eating. When cats do not eat going on 72 hours, they develop a fatty liver. A fatty liver is fatal without treatment, so anorexia in cats is considered serious. While bringing home a new cat is stressful for the existing cat, it typically does not cause severe lethargy and anorexia. I would be concerned that Eloise is sick, and I would take her into a vet today for a health check. I hope this helps!

Any cat that is hiding and not eating is sick. She needs to see a vet ASAP. When cats don't eat for about 3 days their liver starts to mobilize fats for energy and this causes fatty liver disease. So, she may get fatty liver disease on top of already having another illness which will make her prognosis even worse. Please get her to a vet ASAP.

That's concerning! Refusing to eat is often a sign of illness, and without seeing Squid in person, I can't say for sure what is going on. I can also say it can be really serious when a kitten won't eat, as if they go long enough without eating (about 72 hours), they will develop a fatty liver which is fatal without treatment. I'd take him into the vet first thing to take for a health check. I hope this helps!

I would recommend trying to keep the kitten and older cat separated for now. Than slowly introducing them back to each other. I would make sure that the older cat has a litter box and food some place away from the kitten that way he will feel more comfortable eating. It is very important cats eat every day. If Niko is not eating anything he needs to go see a vet. You can try feliway which is a cat pheromone to help decrease stress in the house too. The reason Niko is acting out is due to stress in the house

This is a medical emergency, and Blacky has to see a vet now. If a kitten goes longer than 72 hours without eating, they will develop a fatty liver, which is fatal without treatment. Leaving her like this is cruel, and you need to find a way to afford a vet. Borrow money from family and friends. See if your vet accepts payment plans. You cannot treat this at home, please take her into a vet right away.

Thank you for submitting your question regarding Kenji. The stress of the new kitten could have started his symptoms, but most of the time a cat will adjust to new circumstances in the amount of time you have described. If it is not stress, he may have contracted an illness from the kitten. I recommend that he sees his veterinarian again or you can consider seeking a second opinion. Bloodwork would be warranted at this point. Cats can actually develop severe liver disease if they go extended periods without eating. I hope this information helps!

It sounds like Akira may be sick, and it is very serious when a cat won't eat. If they go long enough without eating (around 72 hours), they will develop a fatty liver. A fatty liver is fatal without treatment, so you want to avoid this. Have her seen by a vet first thing in the morning.