A Rottweiler I had one time ended coming home with a broke jaw. I didn’t know it at the time but after a visit to the vet, sure enough broke jaw. The only thing holding it together was his back tooth with double roots. The break was straight up the middle between the tooth roots. Only thing I could figure out was he was kicked by a deer, he had cuts on his forelegs. After about 6 weeks you would never know by looking or his actions anything was ever wrong. So within a couple of months after he was completely better he started not minding me and would growl at me when I would try to lead him. I figured he was going through his teenage years as some dogs do, testing the waters. I was willing to work through it. Things changed rapidly with the family though, he growled at my little boy while the dog was eating. All my son did was pat him just above his tail on his back as he was walking by. With the growl came the hair standing up one the neck. Now keep in mind this dog was raised in the house, food taken away during eating and given back to show non threat situation. He adored the kids they were never mean to him. Here’s where hatters May hate, I had the dog put down. I would not consider giving him away with the kowlege I had, and I surly was not keeping him at my house. This was not a dog I bought from some back yard breeder, I paid $1300 and had him flown from California to NC. From a reputable breeder. Bottom line, things happen, in my opinion a responsible dog owner always keeps an eye out for changes in their pets. For what it’s worth, I cried like a child when the dog was put down.