Breed is unimportant but I'd suggest that you have a short-haired dog to do this with.
If not you might try shaving the underside of the animal around his genital area so that if you do oral on him you won't get a mouthful of hair.
Out of the 71 women I've trained for K9 sex I've only had one who didn't enjoy it and continue on with it.
Once he's enjoying licking you it's time to rid yourself of the greasy sausage. You wouldn't want him to smell you during that time of the month and start nuzzling his nose in your crotch with friends or family present.
Be patient, both with him and youself, allow several weeks (2-3 weeks) of giving him the code command for licking your pussy for it to absorb into his mind.
I have for years used this method to achieve sex with dogs for females and have found it to be tried and true.
And if you've got a system that works ya just don't go and mess with it.