I don’t know if there’s anything unique about the “tiptoe” variant; it’s just one form of what’s called “gait disturbance”, which in turn is one manifestation of physical coordination problems that often seem to accompany autism. Something about the neurological phenomena in autism also affecting the locomotion center in the brain or something…
Ok, so he’s normal and it’s not autism. Any diagnosis for why he looks ‘stoned’ all the time, then? 
I was present for the postmortem exam of a champion pekingese dog. He was “famous” at the time for what everyone described as a “jaunty gait”. Well, when his brain was removed, we were stunned. There was just a thin rim of cerebral cortex. It was hard to understand how he could even pass for a dog, but he did. His gait was actually pathologic, not anything the dog did with pride.
Second hand smoke?
No, his brother and sister stick strictly to menthols. :eek:
Don’t know why but that really tickled me. Made me actually laugh out loud. It seems that my bursting out laughing for no apparent reason is a cue to my two dogs to get up, go to the cabinet where treats are stored and stand there kicking the cabinet until I fork one over.
barking mad, I tell ya…