On one hand I like (a lot) the phrasing 'in partnership with', since that very much what dog sports are - a partnership between human and dog.
On the other, I am a big fan of the law seeing my dogs as my property, and have a knee jerk negative response to anything that goes out of its way to avoid that language.
So, basically, I could be made happy either way. It's not actually a particularly huge deal for me.