I was taught, too many years ago, that a seafood heavy diet it not good for male cats. Can cause kidney problems. I have four male cats and I take it very easy on the seafood. Asher is very picky, but when he gets hungry enough he will eat. We’ve had several stand-off’s over canned food. I give him 20 minutes to start eating a new food. Then I take it away and put it out again at the next feeding time. I leave dry food out all the time. Canned is once a day at 8 p.m. He constantly tries to convince me that he’s starving at 7 p.m. and the new food is no good. He’ll even knock the dish on the floor. So far he’s letting me win.
Clean it up IMMEDIATELY. Redirect when he starts to eat it. Don’t leave him in the yard by himself and supervise closely (you should do this anyway). I would talk with your vet to make sure he’s eating a proper diet for his breed and age, as well.
This is just something that puppies do, especially if they come from puppy mills.
The only thing that truly works is getting to the poop before he does. Take him out to poo on a leash and move him away from h I should stool before he can eat it, and then pick up and dispose of it so it isn’t available later.
He will most likely grow out of this behavior.