Whatever (s)he was named when (s)he had 4 legs.
I am not sure this is strictly relevant but some dogs terrier walk on 4 legs but run on 3. They tuck one rear leg up and just use one at the back. I am not sure why. Could call it George after Animal Farm by George Owell: 4 legs good 3 legs better.
is it a boy dog?
i would name it paco...because Paco is an epic name........
a stray from my old neighbourhood.......a bulldog......we called him "Bud" :-)
Hop a Long
I think a few people would name the dog Tripod. I probably would too.