Abused dog

Yesterday I woke up to Sasha barking I came out of my room and let both Sasha and Kiki out they both ran off to the fence.  I soon found out why they were barking There was a male min pin Jack russel mix laying fast asleep in the front yard I ran outside and picked up the dog I knew that It was Milo it looked like him.  So I brought him back to his owners.  I had to do it four more times after that came the fifth time after that I took him in for the night.  Milo slept with me and Sasha last night I noticed that his body was burned by something he had cuts all over him I am thinking of keeping him temporarely until he heals up I am not bringing him back again not after what I saw.  The poor dog he is afraid of people.