So over the weekend my dog mix/mutt bit my friend in the hand when he reached down to see what he was chewing on. This is the second time this has happened now, the first was about a year ago when my wife tried to get a catnip toy out of his mouth. I talked to a trainer after that and got him neutered. We have been working with him since then about aggression when he has something he shouldn't have. He doesn't do it with food and seemed to be better with everything. This just happened so quick. I am really not sure what to do at the moment. My first thought is to have him put to sleep. I let my wife make the decision the first time since it was her that was the one bitten. But this time I am not seeing any options, the dog had a second chance and did it again. Of course she still doesn't want to put him down. I really don't want to either, but I also don't want anyone else getting hurt. I guess I am just looking for any advice or experince you guys might have had with this.