I had a crazy idea recently. What if you could have a Deathclaw as a companion, but in order to acquire him you must feed him Dogmeat (the dog) and incur bad karma for the act. The deathclaw would do all the stuff Dogmeat could do, except be much cooler doing it lol.
I have no skill as a modder so I thought I would just throw this wacky idea out there to see what becomes of it. I do not want or need any credit for this idea.