Agree with everyone , he looks fine just make sure he maintains and doesn’t get thinner. Ellie is the same way sometimes skipping meals. We used to be concerned but seems par for the course with this breed. She will graze more than woof it down, then occasionally eat like crazy for a few meals. We add coconut oil, Probios powder, and nupro powder to each meal. Also don’t worry about the poop, Ellie does one firm, followed by a soft serve a few minutes later on her daily runs.