We just adopted a very sweet 6 year old fixed male. His previous owners informed us that he has food allergies and has had reactions to shots. He's on a special diet of dry food. Our current cat eats wet food and he's a this morning they actually ate together with minimal hissing. but the male wanted the wet food.

I'm just wondering if people with more experience can tell me more about cat food allergies. What are they allergic to specifically in the food? are their any brands of cat food available for cats with food allergies or is it only vet brands? Are their wet food options? If he accidental eats the other cats dinner should I be ready for an emergency run to the vet?

Can he still enjoy meat as treats? Should I switch both cats to the same diet?