I have a 3 year old male American Eskimo Dog. He was found as a stray and came from a shelter. He is friendly to about 99% of people, but every now and then there is the 1% where he does not like the person. Unfortunately without any growling, barking or warning, he tries to bite their hands. Even if they are not petting him. Worse yet, it is more than nipping. He has broken skin. One incident was reported, and he was quarantined for 10 days. The second incident was not serious, only because I had him on the leash and I was able to pull him back before he could make serious bite contact. The first person was a 16 year old girl who was sitting on a couch. The second was a 8-10 year old boy at a Petstore. Neither person had anything in their hands.
With myself and my family, as well as most friends he is playful, likes to be pet, and he brings his toys and drops them at the person's feet. He readily rolls onto his back and lets people rub his belly. He does not have very much training, but does know the Sit command. He tends to be active and a bit on the wild side. He gets along with my other dogs ... no food or dog aggression.
I am at a loss as to what to do because I only see the behavior infrequently, but when it happens the dog is very aggressive and it is dangerous. I cannot identify what the trigger may be and I cannot experiment to find out because of the danger.
Any suggestions on what to do?