I look through the costume shop, one of those seasonal stores, this one only selling specifically Halloween products, costumes, makeup, decorations, films, games, collectibles from various horror franchises, and more. As classic seasonal songs play in the background I struggle to find a costume that catches my eye, most of them are just to generic, skeleton, ghost, pumpkin, sponge Bob. I spot something glinting, the tag of what looks like a spiked black leather dog collar, one hanging on its own. What was a dog collar doing here? Where is the rest of the costume? Almost drawn to it I move closer. Is it something kinky? My cock can't help but twitch slightly in my trousers as I take it off the hook it was placed on, I know of puppyplay and have had many fantasies about being reduced to another person's pet. 

Curious I look at the tag, thinking that might give me some sort of answer as to what it was supposed to be but it is just blank, only adding more confusion to the item. I continue to look at it, a small voice and niggling temptation in the back of my mind telling me to put it on, all other costumes forgotten, this one being the only one I seem to care about. 

"Can I help you?" I jump at the kind and sudden voice behind me, one that is softly hypnotic, quickly turning and feeling slightly embarrassed as I just hold the solitary dog collar. He smiles as he sees it in my hand.

"Ah, yes, that one is a good choice, I think it suits you." I struggle to think in humiliation but his calm and kind tone makes me feel reassured, he isn't judging me for my choice, he even seems to encourage it. 

"What is it supposed to be a costume of?" 

"It's the collar of a hell hound. Do you wish to try it on?" Hell hound? I look at the collar and my mind can't help but want to try it on. I don't say anything as the shop owner gently guides me to a changing room, one almost hidden at the back of the store. The only other person there being a woman holding what looks like a strange harness with a headpiece and bit gag and a pair of strange boots that end in hooves with no heel. This place does seem to have some interesting costumes. 

I walk into the changing room and pull the curtains shut. I stare at myself in the large mirror, my image rippling slightly for a moment. I blink my eyes as the temperature seems to grow in the confined space, part of me wanting to take off my clothes. Maybe I should, I doubt hell hounds wear clothes, just like other dogs don't. Without thinking I strip and stand naked, my clothes discarded uncaringly on the floor. I look at the collar longingly, my body feeling naked without it, an empty feeling that only it can fill. I smile as I bring it up to my throat and wrap it tightly around my neck, making share that it is secure and unable get loose, the feeling comfortable and comforting, feeling fully dressed as I stand completely naked. 

I scream in pain as a burning flows through my mind, as if something is altering my brain. I suddenly drop to the floor, my mind seemingly forgetting how to stand and walk on two legs, as if that part of my brain has been burned away. As I move onto all fours I realise that I can no longer scream, instead quiet whimpering sounds escape my mouth as I forget how to use my hands. I helplessly paw at my collar and bark as I call out for help, seemingly unable to speak, all words lost, my mind unable to form them in my mouth, unable to even remember what they are. What is happening? Why can't I speak or stand or grip anything? It must be the collar, I need to get it off of me. But do I? It feels so nice, it feels right, it brings me comfort. What am I thinking? 

I stare at my naked self in the mirror, on all fours, i can't help but like what I see, my cock twitching at the sight. Maybe this isn't so bad? Although something seems missing, a pet needs an owner, a master. Where is mine? I suddenly begin to feel scared, anxious and lonely, I let out a small whimper, the creature in the mirror looking pathetic and helpless. I call out, barking loudly as I desperately try to summon my owner, every moment without them agonising. 

I can't help but pant excitedly with joy as the curtains open and I see the shop owner smiling down at me, not even noticing or caring that the area outside of the changing room is now completely different from the small store or that I’m completely naked and on all fours in full view of them or anyone else who passes. 

"Hello there my cute little puppy. You want to come with me and be my hell hound?" I barely process the words, some of them having no meaning but I seem to understand the question, I have a choice to make, be his pet or return to my old form and life. The answer is obvious right? I feel the collar around my neck, how it feels to be owned, the pleasure, the meaning and purpose, the value, the comfort, the love, the joy. What do I have to return to? Yes, the answer is obvious. 

"Woof!" I excitedly let out my response before I can even finish my thoughts. 

"Very well." A flaming leash grows out from my collar, the end held in his hand, as my name appears on the tag, as it does i feel a burning in my crotch as my balls vanish, leaving me a neutered dog. I feel a warmth spread over me, a happy contentment, my mind empty of worry and thought, just happy to be owned and loved, only wanting to please my owner, my desires are his to decide. 

I obediently follow him out of the changing room, not feeling any fear as I step out into the unknown of the the fiery world around me, the warm ashy ground feeling pleasant beneath me, knowing my owner is holding my leash meaning that I'm safe. I follow him to a cart, one pulled by a man and a woman, the latter I vaguely remember from the shop. Both are naked, with tight harnesses, headpieces with red plumes, bit gags and small bells dangling from their nipples, both with their arms restrained behind them, held in tight armbinders, ones that pin their elbows together, both standing tall in hoof boots, ones that keep the feet in a downward position that must be painful after a while, especially with no heel to put weight on, and both wearing a chastity device, the male a cage and the female a belt, both with a tail attached to a buttplug. 

I eagerly climb into the cart as my master sits and taps the seat beside him, his hand lovingly stroking me as I sit next to him, my hind legs tucked under my ass, my front legs supporting me. With a flick of his whip cracking against the ponies asses we begin to move, where to I don't know but wherever it is I'm happy to be with my master. 

As we move I hear a zip and smell a delightful fragrance and look down at my owners crotch, seeing his huge cock. Without needing to be told I immediately lower my head and slide my lips over it, happily sucking and licking it hungrily, desperate to receive my treat. Tasting his wonderful and delicious cum I swallow it down, pleased to have brought my owner pleasure, as I curl up next to him and fall asleep, seemingly not phased by the extreme heat and ignoring the cries of terror and suffering and screams of agony and pain around me, as the ponies are forced to continue pulling us onward, my owner whipping them every now and then to encourage them to keep moving despite their sweaty and exhausted bodies.