My GF and I are very open and kinky with each other and recently we bought and tried out a k9 dildo. My GF absolutely loves it and I am afraid to ask if she would try the real thing.
and you want "us" to tell her the real thing is nothing like a dildo or what exactly is the point here? seeking advice from random internet strangers?
do i just go "nice"?
Ask her. If she's gotten to the point of sticking a dog dildo in her pussy and she likes it, it's quite likely that she'll be interested in the real thing too...