Hello I have a male not neutered 14 month old presa he has always been very very food protective. just recently he started hanging his head, walking very slow, hair sticking up on his back, tail between the legs, and if anyone other then myself gets near him he growls... All at once. This occurs at what seems to be random times for about 30 mins. Is this fear? If so should I try what the person suggested with the treat? I feel like that's rewarding the behavior. It happens when he's in the house with us... The last two time it happened when I was playing with our new female pitbull could it be jealousy? Any input will help thanks