If an older cat stops eating for an extended period after a new cat arrives, it can indeed become ill and potentially face life-threatening consequences. To prevent this, it's crucial for owners to promptly address the older cat's emotional state and offer foods it enjoys.

When introducing a new kitten into the home, prioritize the well-being of your older cat; don't focus solely on settling the newcomer. Initially, confine the kitten to a designated room with food, water, and a litter box, allowing it to familiarize itself with the space. Then, immediately turn your attention to your older cat. Offer cuddles, petting, and reassurance, explaining the presence of the new kitten and encouraging them to coexist peacefully. Avoid showing excessive attention to the kitten simply because it's new and cute; this could provoke jealousy or resentment in your older cat, leading to behaviors like refusing to eat or play. These are common ways an old cat might protest.
Understanding the Root of the Problem
An older cat’s refusal to eat is not just a behavioral quirk; it can severely affect their health. This loss of appetite often stems from a deep-seated anxiety related to their perceived loss of status and territory. Cats are inherently territorial animals, and the introduction of a new cat is often perceived as an invasion of their established space. It’s crucial to understand that the older cat isn’t just being ‘difficult’; they are experiencing significant stress. The perceived threat to their resources (like attention from their humans) can be a huge factor in appetite suppression.
How to Encourage Your Older Cat to Eat
If your older cat isn't eating, here's a comprehensive approach: Offer a selection of their favorite foods, adding some digestive enzymes(like those found in ‘Meow Digest’) can help them absorb nutrients. Focus on your older cat’s needs during this transition. Also consider offering high-calorie nutritional pastes or gels. Provide familiar, safe places. Make sure the older cat has access to areas where they feel secure and can retreat from the new kitten. These could be high perches or quiet rooms. Ensure the older cat has easy access to food and water bowls, separate from the kitten’s, to avoid competition. This can ease any perceived rivalry. Patience and love are crucial during this time. Consistent reassurance and affection will gradually help your older cat adjust to the new family member. When needed, consult your vet. If the problem is persistent and accompanied by other signs of illness, consult your veterinarian who might be able to rule out any medical causes and prescribe medication if needed.