I waited in the car for ages trying to summon up the courage to go through with my idea. After finding the human puppy school on the net I had contacted the 'trainer' and he'd invited me along to his kennel to see how I liked it. So here I was, and I decided to go ahead and give it a try. I knocked on the door of the ordinary three bedroomed semi and must have looked like any regular guy to the people passing in the street. The door was opened by a middle aged guy, slightly bald, and a bit overweight, wearing regular jeans and t-shirt; I introduced myself and was invited in. I could hear barking noises from behind the closed living room door and, as soon as the front door was closed to the rest of the world, the trainer opened the living room door and an elderly naked man crawled out on all fours with a dog collar round his neck and black mitts covering his hands to make them into fingerless dog paws. He crawled over to me and immediately shoved his face into my crotch and started to sniff. I was pretty surprised but also turned on by the nuzzling of my hardening cock; however, as if he were my dog at home I stepped back, said "no" loudly and whacked him hard on his bare arse. I was really beginning to get into this I thought!
The trainer showed me into the lounge and we sat down on the couch chatting generally about what he provided and what I felt comfortable with; he'd shut the door and again I could hear the human dog barking outside. I said that I was pretty comfortable with most things (but as I'm only 21, I was pretty new to most and hadn't really tried much before); the most important decision I had to make was whether I wanted to be a 'sire' or a 'mare' as he let his 'dogs' breed at his stud kennel and needed both males and females. I said I wasn't sure so he told me he'd let the other 'dogs' decide for me, which was slightly concerning.
After the chat we were ready to get started and he took me through the kitchen into the utility room and he told me to strip completely; I expected him to leave to give me some privacy but instead he stood there watching my every move. I took off my watch and put it in my pocket then kicked of my Nikes, unzipped my hoodie and took it off, I pulled the white t-shirt over my head and the coolness of the room made my nipples tighten. I hesitated for a second or two and could see the trainer watching me with his arms folded across his large chest before I undid my jeans and let them drop to the floor before pulling them off completely and putting them on the work surface next to the rest of my clothes. I was now left standing in white sports socks and my baggy boxers which were tenting over my erect little cock; I removed each sock and thrust them into the trainers and then pulled my boxers down over my cock letting it spring to attention. I felt really embarrassed having to bend over to pick up my boxers as it meant showing my arse to him but I tried to over come the nerves and turned round to face him completely exposed while he was fully dressed.
"Very good," he said, "as soon as I put your collar on you will become my puppy, you can only make dog noises, and must stay on all fours. Your new name is 'Samson' and you will respond to that whenever someone calls you." He opened a cupboard and took out a woven blue dog collar and adjusted it to fit my neck size before clipping it into place, he then lifted up my hands and clenched them into fists before putting on the black mitts which restricted my fingers from moving. "Now get on all fours, Samson and be a good doggy for your trainer." I obeyed his first command and fell to the floor; almost straight away I began to feel like his dog and couldn't help sticking my tongue out and panting, which he rewarded by ruffling my light brown hair.