our neighbor who just got their rescued 3 yr old pitbull asked me if we could bring our dog to their backyards so they could be playmates. I said yes since i've known them for over a year now and i also think it's a good idea. at first, they are just trying to get to know each other since they are only meeting for the first time, we let them play in the backyards then suddenly we heard a growling and we saw them fighting. we immediately came to them and i dont see any injuries from my dog but after that day i noticed my dog suddenly became weak he just lost his energy and strength. i looked it up on google and saw an article abt internal injuries. some symptoms said that it could be intternal injuries but we are hoping that it is not. we are bringing him tomorrow on the vet.