Is he your pup that's liver compromised?
I am no help because Ellie's is 18% fat. Because she just had an episode of pancreatitis again, we are reducing the fat. It has to be rebalanced by her nutritionist. Fun times...
I will say (while it may not be popular) that the low fat recipes I've seen on YT probably do not meet AAFCO guidelines (and I'm guessing not NRC either). The % of fat is sometimes questionable also if the nutritionist doesn't figure out the guaranteed analysis.
Hope he is feeling better.
