There are three sets of trios here. Each trio is related in some obvious, straightforward way. E.g., Police, Fire, and Super would all go in front of “Man”. Can you click all nine?
If you see a group of 4 or more, you need a more specific criteria.
If they update Wikipedia to say he isn’t an anthropomorphic dog, I’ll update the quiz. He was a dog for 80 years, so I don’t think a Disney statement released after the death of the original artist died matters much.