willowchow:
Oh, wow, that is odd behavior. How old is Legend now? His "real" behavior is very similar to Willow's--she jumps over puddles too. Could this cognitive issue be what caused him to lash out like that? Maybe he just didn't realize what he was doing? Oh, the poor chow chow.
Possibly. It's as if he can't remember how to respond to that kind of behavior.
He was 12 in March. Not ancient, but an older guy.
And yes, he's normally a very, very clean dog.