Letting out a groan that ended with a growl, you felt parts of your face cracking and forcing themselves forward. Feeling the bones in your legs crack, bend and bow, and shift around the angles under your pant legs. Similar sorts of discomfort and changes occurred to your arms, where your thumb is being tugged up your thinning forearm.
You were getting paws in place of your hands; fingers getting shorter and nails moving to the tip.
Getting up again, you stumble again and find it easier to move on four legs. Sneaking behind some more tents and trailers, you're able to get into a nearby alley but another wave of changes starts to hit you.
Your clothes started to become looser as the buildings around you got seemingly bigger. The worried noises you make are canine whimpers almost and that is scaring you more and more. Things started to slow down again, but with six budding nipples and a swollen sex, you were certainly female. Some sort of lab mix, your vaguely human head was on a mostly canine body. You stepped out of your pants and underwear, feeling your tail wag free for the first time. Stepping on a bit of the loose sleeve, you get out of that as well so that you only had the collar on.
While you stripped, some three other roving mutts caught your sent and wandered closer. By the time you do realize, it's seven of them all circled around you. No sooner do you feel their eyes on you than pain comes over you. What starts as an almost word ends, as your muzzle cracks and extends out some five inches while sprouting whiskers and filling with more fur. It was also sprouting wherever it could on your body, in patches of white, black, and brown.
A few more inches and pounds and shed, a bit more muzzle and filling on the pads of your feet and you're physically a mutt now; a bitch in heat. When you opened your eyes, it was a weird sense of perspective and definitely a change of power structure. Panting, you're ashamed that the thought of being mounted was keenly on your mind. With a glance to those around you, you simply yelp and put your head and leave your ass up.
Three sniff and lick at you but it's a spaniel mix that finally jumps on top and makes contact. You feel his cock slide into the tight hole you now have and yelp. He starts to pound and you realize you're never going back to humanity. Your phone even buzzes with calls from friends trying to meet you at the fair while you feel the knot swelling. As you're sealed to the dog, all you can think of is how big your litter will be. Three more would have their go at you before you disappear with them into the streets.