Just an update on Cocoa.
On his return check up on March 5 he was diagnosed with diabetes. His blood sugar was 520! He was not doing well on the Purina OM and it probably just contributed to raising his blood sugar level due to the high carb content of that food. Why the vet put him on it in the first place knowing his glucose level was elevated is beyond me, but just reinforces everything I have been reading about most vets not knowing or caring much about feline nutrition, other than what the food companies tell them so they will push their products.
I am now giving him insulin twice a day,(this is not fun for him or me ) feeding him grain free canned food and hoping to someday be able to eliminate his need for insulin.
I have sure learned a valuable lesson about feeding cats food with high carb content and the negative effect it can have on them.