Before Yoshi's cancer diagnosis, he wasn't eating but I could get him to eat bits of raw chicken and cooked egg yolk. For the egg yolk I cooked an over easy egg with it cooked but runny yolk and he'd lick up the yolk.
Don't know if this is appropriate for your guy but there is also the "liver shake" for sick kitties posted here five years ago. Here's the post ---
THE '~LIVER SHAKE~' FOR SICK CATS
This liquid food is appropriate for cats suffering from conditions where they are eating very little or not at all such as anemias, leukemias, deficiency states with symptoms of lethargy, listlessness, and weakness.
1 cup RAW LIVER (BEEF, or CHICKEN)
1 cup FRESH CARROT JUICE or V-8, or Tomatoe Juice
1/4 cup *FRESH FILTERED WATER
1 RAW EGG YOLK
1 tsp.KELP POWDER OR SPIRULINA
COMBINE AND MIX IN A BLENDER UNTIL LIQUEFIED. (Note: it will be frothy)
Dosage:
Administer 10cc daily 3-6 times a day. (6Occ per day max)
Some cats will need to be force-fed with a syringe, while others will drink it out of a bowl.
This food has a sweet and salty taste, and the energetic properties of tonifying (energy boosting), warming and stimulating and supports the kidneys, spleen, liver and stomach.
This drink is a complete dinner for a sick cat until they feel good enough to eat by themselves again.
*Substitute rice water if the cat has diarrhea. Rice water
is made by boiling white rice (2 Tbsp) with water (1cup) for 30 minutes.
This liquid aids digestion and assimilation and inhibits the symptoms of diarrhea.
Deborah C. Mallu,DVM
recipe developed by Dr. Ihor Basko, Kauai, Hawaii