I had a male border collie when i was younger, he was a little chunky, but all it did was give him a curvy body, he had super wide rear hips that made it look like he had a big booty. Anyways one day i was laying down in my room when he hops up on the bed with me, so as per normal i started scratching his lower back when all of the sudden he turns around and sits his ass right on my face, but as soon as i touched his tail he growled so i continued to scratch him to keep him distracted long enough to lift his tail and expose his asshole. I then buried my face in his ass and smelled deeply to get a strong whiff of his musk. I then slipped my tongue inside his ass (all while continuously scratching him to keep him occupied.) I then rimmed him like that for aproxx 8-10 minutes. I got my tongue pretty deep inside him. I even felt his hole contract around my tongue as i moved it in and out. He was the sexiest dog i ever owned. I wish i had a pic to show how much of a booty he had. That dog was dummy thicc. I miss him dearly.