I am by no means an expert in this, but sometimes it is something inadvertant that causes behavior like that. I am not saying that your husband did anything bad, but maybe he caught Boomer off gaurd or something. Just a guess.

I agree with Karen, have your husband give out the treats or maybe do the daily feeding, if that is possible. Anything that will associate your husband with what Boomer likes.

Hopefully, this will be a mild bump in the road.

Keep us updated.