looks like he might have some pit bull? The community that I live in has ALOT of pit bull dogs/mix- not considering any behavioral issues, getting another dog now will be a good playmate for you first dog. Our first set- over 16 years ago- were less than a year apart and they got along great- one female, one male. Currently our 11 year old male gets along pretty good with our 1 year old male puppy- we have always had our dogs spayed/neutered at a young age. Hope this helps!