There has to have been some child giraffe that went out into deep water where it didn't reach the bottom? You could maybe extrapolate from that.

Dog swimming surely ought to be unstable with that long of a neck and legs.

How does this save me a google search? Either it can swim (someone's seen it swimming) or it can't (nobody has seen it swim). If it maybe can swim, I have to google it.

lol. True. But if you find a swimming giraffe post it here. (Not computer animated).