A friend adopted a two year rescue dog with anxiety issues. No one knows the dog's history but he had serious abandonment issues and needs to be put on Prozac if left alone for more than 1.5 hours or so. I was visiting my friend and we went through a long process of getting the dog to become comfortable with me. After that, the dog was cuddling with me, letting me pet it, etc. My friend and I left for about an hour and when we returned, the dog bit me when I entered the house. For the rest of the day, the dog stayed outside and I stayed inside. At some point, my friend had to walk the dog, and I came with them. The dog randomly barked at me twice when I was standing there minding my own business.
The bite wasn't bad, but what does this mean for the dog? Now, my friend has no way of knowing whether the dog will do this again. Is this normal rescue dog behavior or a more serious sign that the dog might not ever be fit to be around humans? Help!!