You finally settle down and stop howling, letting it sink in that you're probably destined to completely become a dog. You've owned dogs, petted dogs, played with dogs, walked dogs, been attacked by dogs, even thrown rocks at dogs when they came on your lawn. Heck, you even kind of like some dogs, especially Dalmatians. It never once occurred to you that you would ever end up being one yourself. It never even really occurred to you that real witches might exist, much less that you'd end up in a car accident with one.
You kinda deserved this, though. As a person, you really were quite arrogant and belligerent. Of course, you just thought of yourself as "manly." A MAN had to always be in charge. A MAN couldn't let the other driver get the best of him after an accident, and a MAN absolutely couldn't lose an argument, especially to a woman. You finally made the wrong outburst, to the wrong woman, who had just the right power to ensure that you weren't a MAN any longer. And you hate it.
You hate your cute polka-dot fur, your floppy ears, your slightly curved tail, your long wet tongue, you're big bony muzzle, your urge to pant and sniff and mark your territory. You hate facing the fact that you know what all of those feel like, just like a dog does. You especially hate the fact that you're not even a MAN down there anymore, just a male, and that you're now looking down at what any plain old male Dalmatian DOG sees when he looks between his legs.
But it's yours now, and you have to deal with that. Growling in frustration and reaching out with curiosity, you bring your hand over (at least it's not a PAW, not yet anyway) and grab that ... that THING ... sticking out of your crotch. Whoa! Your dick is HARD. There's no way you actually have an erection right now... do you?
You remember from somewhere that most animals, unlike humans, actually do have bones in their penises, so they're never actually soft. "I guess I do too now," you think to yourself, trying not to wonder what an actual erection will feel like. Wanting to see your dick (well, your sheath at least) from a different angle, you try to pull down and forward so it's not pointing right up at your face. It's no use: your sheath holds your dick right up against your abdomen, just like a dog's does. You can sort of wiggle it from side to side a little, but it always settles back in place.
Messing with your genitals soon has your penis sticking out a little ways. The bright pink tip poking out of the top of the sheath looks weirdly out of place amongst all the black and white you're otherwise covered in. "Shit, is that mine now?" you think, brushing the tip of it with your palm; it's moist. "This thing's sensitive," you realize with the pleasurable feelings running down your shaft. You may never have been a dog before, but you have been a male, and the feeling of arousal comes as no stranger to you. You soon notice more of your penis emerging from the sheath. You wrap your hand around it and moan at the pleasure.
Whether it's actually more sensitive, or just startlingly different, you can't tell, and you really don't care. You let yourself get lost in the pleasure. You've had nothing but pain and disappointment from your body since the witch cursed you. This at least feels good. You're tired of fighting impulses. You hate this, but you're going to know what this feels like.
Before long a weird swelling starts down in your sheath, which really freaks you out. "Did I break something?" you ask yourself. Touching the swelling, though, almost makes you orgasm then and there. It too emerges from the sheath and your penis gets bigger in a hurry. Finally your whole body tenses up from head to tail and you know what's coming. Familiar muscles way down underneath your dick start twitching, spurting semen far out into the room. Coming down off your orgasmic high you're shocked that your penis is still enormous, and doesn't seem to be losing it's erection at all. "Is this normal for dogs?" you ask yourself, only to feel yourself sadden, having reminded yourself what you are now. You go back to fondling your still erect, oversized penis, if only just to calm yourself down. It may not be what men feel, but at least it feels good.
You keep doing this until the pain from the curse jolts your body once again...