Pits do make great pets and can be very loving and playful, it all depends how they were raised. Only thing is pits require a lot of room to run and chase other little varmints and such, they are very active dogs maybe too active for someone to use as a service animal. Although very easy to train if you take the time the will always remain aggressive and need a safe outlet to express that( pulling on ropes, active play areas ect).mine are excellent service animals they keep anyone from entering my prop. and if someone does they are very efficient at making sure they don't try it again . Hahaha . Then come home and play with no aggressive tendencies towards known people. When I say come home that's because my (yard) is 160 acres, giving them plenty of room to run and play, they have never spent one day on a chain nor in a cage. Great pets if treated right! Service animal ? Loyal, trustworthy, breed but due to all the media and the fact that most people mistreat them! Super bad rep! Hey but good fortune in your endeavor ! Pray for the best outcome for you! Seems like a sincere plan.