TBF you're perfectly entitled to feel it was "wrong" to have two dogs playing the same character in different parts of the skit.
It doesn't mean anything though, other than that's your opinion. It doesn't mean anyone else should care, or that suddenly because of your opinion the competition is null and void, or basically anything.
Personally, I don't care. It was her dog, she trained it. It's not like it was a stunt dog that she had just hired for the part. That would have been over the line, I think we can probably all agree on that.