I play a lot of sky wars. Although I don't personally use the wolf kit, I see a lot of people who do and all that ends up happening is someone else on their team just kills their wolves on purpose.
It's way too much work on the part of us as players to report every single instance of this happening (because I see it happen literally every time somebody has a wolf kit) so I think the best thing to do would be to just make it impossible to strike your teammates wolves in the same way that we can't strike our teammates.