My Dog Got Out Without His Collar The People Who Found Him Harmed Him Is There Anything I Can Do?

Yesterday my dog Pongo got out I hadn't realized when he did because I finished a graveyard shift and got home at 6:30-7:00 am, he was in the backyard still, it wasn't until 1 in the afternoon my sister woke me up she said my dog had gotten out she had left the backdoor unlocked he can pull it open, I took off his collar the day before because it itches him, so he had been loose for a couple of hours we searched the area because he doesn't stray far we searched for an hour and nothing my sister began looking through Facebook nothing but when she checked Fit Fam she found a post about him they had found him 4 hours ago so for that time the people had him we went to the area they posted and we got him back I brought him home and showered him gave him his dinner (he wouldn't eat) but he seemed off it wasn't until I saw him panting I noticed his teeth were different I tried to get a better look but he wouldn't let me look at his mouth he would just lay his head on my chest when I finally got a good look the people who had him filed down all 4 of his main canines the top and bottom! So I have to ask is there anything I can do legally? Can I press charges? Tomorrow I am taking him to the vet and hopefully he doesn't have an infection also to help with his pain, I also live in Texas if that helps.