Well if ur dog is nutered then good luck with that but u could just do a friends dog when u spend the night there. Thats what i do.
Where do u live I have trained my dog if u get In front of him with your pants down he will fuck you
Get back to me if interested
Seek help - not normal
Find a bitch in heat and rub her juices on you ass. That will get him going. Just remember when he nuts his cock will swell and prob get suck you there for a while. Good luck with that.