I'm a foster mom of a 2 yr old Basenji/Shepherd mix (?). With just a split second warning and no apparent trigger, he bit me the other day. This is the second time - he got my husband shortly after we rescued him about about 16 months ago. We immediately met with a well respected trainer who deals with aggressive dogs and followed her instructions to a tee, making sure he knows we're alpha, blah blah so I don't really think that's an issue.
He's always been a little snarly early in the morning and late at night but he'd always stop right away and would be fine like it never happened. But this time he went after me and bit me in four places, even tearing a foot long gash in my shorts. He "only" broke skin in one area but I got some pretty nasty bruises from it. Anyway, I was so shook up I went to my neighbor's house and waited for my husband to come home. About 45 min later we went back in our house and he immediately went nuts. Our poor coonhound happened to be in the line of fire and Joey (our Basenji) went after him too. My husband got him off so he wasn't hurt - physically anyway - and after a huge struggle, finally got him into his crate.
The weird thing is that once he was in his crate he literally growled and bared his teeth until that night when I was finally able to get a sedative for him. Even that didn't totally eliminate it. He'd been growling for nearly 8 hours straight regardless if anyone was in the room with him or not. I even took video of it because I've never seen anything so odd and thought it might help a behaviorist determine what's up. Anyway, the next morning I figured everything would be fine but as soon as I came downstairs he was at it again and was even shaking a little. He kept this up until I got him to the vet that morning. We had to literally carry the crate to the car with him in it because he was acting so vicious.
Since he's been at the vet, he's been nothing but an angel and all his bloodwork came back fine so he's seemingly healthy.
Has anyone seen this kind of behavior? Any thoughts? Please help!