I feed raw Rabbit, but not all the time, I also feed Beef, Chicken and Fish, dogs like variety.
So rabbit say thrice a week along with the rest of meat mentioned will not do harm.
I also use Gain 20% as a mixer.
There's a Pet Whippet near me, who has only been fed a complete of the one brand, started with puppy, now on adult.
never had a bone, or any tit bits, and its totally out of condition,