He asked if the dog was bilingual

Well is he?

Yeah. I don’t see what’s dumb about that. Some animals are multilingual and can understand words in more than one language. Other animals will only respond to words in one language. Growing up I had a friend who’s dog only understood Cantonese (dialect spoken in China and territories etc.) It would do tricks, come, stop barking, begging, jumping, and more- But only if you told it in Cantonese. In English it understood the word “walk” and that was it.

Well, if he can understand commands in both languages, that could count as bilingual