KayAnn. I'm sure Simba has grown up mostly without other dogs? So he's probably not use to having them around. Maybe when he's more use to it he'll be fine I take Jo to our HS dog park, she loves it there. Most of the dogs are friendly so she gets along, but she does growl sometimes if a dog is picking a fight or something :[ There was this little dog, boston terrier maybe? He used to pick on ONLY puppies. If he saw one, he's run over and attack it. Only pups though, I guess he thought cause they're smaller or something..Not sure..I'm sure he'll be fine...you could always try what I did to get another dog, and say "Oh, but he's lonely. He needs another friend" or something like that. Or maybe if you got another dog..it would make Simba more use to them...eh?? LOL sorry...