My name is Choco!

My brother was given this dog at a park, he had him for 15 minutes until he ran off but as he was leaving he came back and hopped in his car. We dont know his exact age but assume he may be around 9 since he’s staring to get a few grays. He already came knowing a couple of easy commands but he was very easy to teach and not difficult. We first kept him as guard dog in our garage but switch him to an inside once the winter and he’s stayed inside since. He does not work well with other dogs. He only stays composed with our other pitbull which he grew around so never really seen him aggressive until a dog walks past our home. He’s very sweet and kind as long as there’s no other animal.