Not only can he stand, but you can see from the beginning of this clip that he immediately realizes from the way I say "Vanh" that he is going to be asked to perform like a trained seal, I mean demonstrate one of his skills...
If my "Wow!" sounds a little overdone it's because I was genuinely surprised - it was the first time he stood up "on cue" like that. Max is happy too!
(Update: Vanh took his first 2 steps the next day...)