You can also try getting some liver-based canned cat food.It's caused by the FIA. Feline infectious anemia. Causes his body to attack his red blood cells because of the parasite. He's already been hospitalized once just a few weeks ago. I'm going to buy some liver tomorrow and try that. Thank you for the information.
I've found a lot of "pate" type canned foods will work for syringe feeding if you add enough liquid to be able to get it to go into the feeding syringe. I also usually warm the food up a bit for syringe feeding, as it seems to be accepted better that way.
What I've done before was add a liquid supplement instead of water to make the food more liquid while adding some vitamins and calories. One of my vets had suggested using Ensure for my dog who wasn't eating but I'm not sure if that is ok for cats. I've also used a liquid meal replacement for pets called Clinicare, and something called Catsure (like Ensure for pets).
I'm not a fan of Hills, but a/d does work great for syringe feeding, it's just the right consistency for it and it's high calorie/dense so you can get more calories in without as much volume which is a big plus when syringe feeding.