I'm working on a Halfling Cavalier and I want to give him a Blink Dog mount with the Monstrous Mount feat. I figured that since it was comparable CR to a Worg, which is already a choice, it wouldn't be too much to ask. My idea for Mastery would be allowing the Blink Dog to take his rider with him when it uses it's dimension door ability.
EDIT:
Sorry, I forgot to actually ask my question.
I was curious if it sounded too powerful for a mount choice or if the Mastery idea was lame and there was a better idea.
