This is what happened to Vick's dogs ...

[EternalEnigma21]

Many bully breeds have a stronger desire to be alpha than most breeds. They are bred to be confident and courageous. With my dog, when he got possessive with a toy at my daughter once, I rolled him onto his back and had her stand over him and tell him "NO" sternly. Also she feeds him and makes him sit for his food. A great exercize in pecking order is to live by the "sing for your supper" credo. Make the dog earn everything with tricks. Walks, food, attention (most of the time) toys, etc... Even if its just a sit, make him earn it.

The most important thing to remember is that these dog NEEDS exercise, discipline, and love in that order. That was hard for my wife to understand at first, and the dog would walk all over her. You need to get him involved in a training class as well. If he gets off the leash and won't come/recall due to stubborness, you may lose your dog. Worth the $100 bucks and 1 day a week to get a structure going. The cool thing is that most of these dogs respond amazingly well to positive reinforcement training methods because they are so easy to please.

*tip. Train him to "drop it" is easy by exchanging the contested item for a delicious treat. Any dog will drop a remote or tennis ball on the ground on command for a tiny piece of bacon or lunch meat/cheese whatever and some praise. You'll find him bringing random things to you and just dropping them at your feet in time and that should help with the possessive tendencies. Good luck!