
The problem is, the less he gets to interact with his own species, the more interesting they become.
Put yourself in his place. You are (as far as you know) the only human on an alien planet. The inhabitants are very kind to you, and you are fed well, and are warm and cared for and cherished. But they don't speak your language, either verbally or bodily. Basically, they're
weird! But they're not unkind, and you quite like them.
Then occasionally you see others of your own kind! Yay! They speak the same language! They understand your body language ... almost, because you're out of practice. Your 'pet alien' (that's us!) can take a running jump!
Your ideal is that he becomes so blase about other dogs they are less interesting than you.