American bulldog puppys appetite has decreased and is itching all over?

I don't see any fleas or ticks at all. He only has some small scabs on his head.

It's probably an allergy - either seasonal or food. You need to have him checked out by a vet.

Please contact vet. Am Bulldogs are prone to skin conditions,allergies...could be 2 separate isssues or food allergy could cause decrease in appetite. Decrease in appetite could be a symptom of anything else ..intestinal parasites or disease process. could even be a picky eater. You need to consult the vet. Good luck, hope it is nothing serious.

Have a skin scraping done to rule out mange. Very common in this breed, and will cause scabbing, and hair loss.