If you think about it, a pet that carries the spike doesn't seem like a good idea to me. With a few shots, the spike is dropped right in the middle of the enemy bomb site. In my opinion, this character will have difficulties entering the META.
Because planting the spike is one less skill if you can take the bomb and plant it yourself. No one would be crazy enough to throw a pet onto a bomb that hasn't been taken over. What use will the pet be after you've already planted the bomb? (Of course, he's still there to defuse.) There are many points to consider on this matter.
Anyway, it hasn't been released yet, I'm just leaving my 2 cents here.