You practically leap from the bathroom and land hard on your knees in front of your father who did this. Staring up at him and his startled face, you plead with him and instinctively tuck your tail up beneath you as far as it will go.
"Please don't do this, I'm SORRY! I don't, I mean I DO deserve to be a dog, but I can't be! I'M NOT a dog! I'm a MAN! Or at least, I'll TRY to be a man. I'll figure out a college to go to. I'll start rehab tomorrow. I'll find a job to earn money for a new car for you. I'll try to be nicer to your boyfriend. I'll do ANYTHING! I'm your SON! You've got to stop this. You know that!"
Your father seems to have expected you'd do this. He doesn't seem to be giving in. He just says, "Teddy, it's too late for that. We both know you've made those same promises dozens of times before. You're never going to change unless someone else makes you. Well, know you'll have a human in charge to teach you what work looks like."
"I am human!"
"Not any more, Ted. We both know this is better for both of us anyway. Trained service dogs are worth decent of money, and so are pure breed shepherd studs if that doesn't work out. We've both seen for sure that you're going to enjoy those new, more sensitive ears, and I can tell that you're already getting used to your tail. Besides, your penis is getting bigger."
You instantly look down. Seeing your tail stuck out in front of you reminds you that you are helplessly becoming an animal, but seeing your penis mostly unchanged gives you a faint brief glimmer of hope. Hearing that your manhood, your pride and joy, your symbol of sexual maturity was changing made your heart sink deep in your chest. However, so far, it really just was getting bigger. You were already considered fairly well endowed, and party girls loved you. You may have looked ridiculous with your tucked tail and your oversized dog ears, but the length and girth you were sporting now just might be enough to make up for it. If you actually got an erection, you would probably please any woman.
You yelped in a mix of pain, pleasure, and pure surprise as something happened. Some THING went into your penis even though you couldn't see it. The sudden pressure inside there felt tight in a way that through you off balance until the suddenness started to wear off. You noticed your penis was totally rigid and was stretched out to its greatest size yet. You cautiously reached out two fingers to pinch the organ and try to find out what was going on. You could sense some sort of hardness in there, and you couldn't seem to get your expanded penis to bend. At first you thought it was like having an erection. You soon decided it was more like having a wooden spike through your penis.
"I, I don't understand," you stammered.
"Oh, you wouldn't know about it, you don't work with dogs, no reason you would I guess. Jason told me most animals have penis bones, but humans don't. Just think about that: you have an actual boner now, and it's never going soft!"
"What? NO! That's inhuman, that's --- wait, really?"
"Yes, really. Maybe you'd like to try it out? You don't need to cover yourself anymore in front of me or anyone else. One of the perks of being just a dog from now on, right?"
You pause for a second. That last part especially made you wince. Being "just a dog" wasn't part of your plan when you got up this morning, and you're not exactly sure you like your gay dad offering to let you touch yourself in front of him. And yet, if he really does see you as more of a dog now, there isn't exactly any harm in it, is there? And you have to admit it actually feels sort of NICE to be this hard, especially since you have the length and girth to go with it. Surely just a quick feel or two couldn't hurt?
Aw, man, that DOES feel good! You do your best to control your pace so that you don't look like a reckless sex maniac in front of the guy (your own dad, no less!) who wants you to become an animal. You still aren't really sure this is worth the dog parts he has given you. But before too much longer you're enjoying this enough that your tail is behind you again and even starting to wag a little. You try to rein in that canine show of happiness as well as you can, but it isn't very easy to keep your tail still when your feeling pleasure. That all comes to a stop, though when you feel something swelling at the base of your cock. You ask what they old man did to you. He only tells you you've found your new "knot" that will "tie" you to a bitch's pussy long enough to make sure she has puppies. You want to accuse him of making that up to disguise injuring your penis somehow, but then you see your whole penis starting to change to a more purplish color before your glans fades away into your shaft. It looks ridiculous! You're not entirely sure this isn't some sort of injury either...
"Don't worry," said your father, causing your ears to perk toward him again, "you won't have to look at that all the time. Dogs don't get clothes, but they do get a pretty neat holster to keep those mighty shafts tucked away in when they aren't rutting." You wonder what he's talking about, but then you feel an odd stretchy feeling before new skin comes into existence. It ends up covering your shaft about halfway and grows fur, but you soon realize this new skin isn't totally separate from your groin. As your erection deflates, you realize your bony penis is going to get swallowed up into this strange fuzzy pouch against your abdomen. And that's the moment you realize that as good as your new equipment feels, it really is a canine's tool for making puppies. You were just reaching your prime as a man, but now your sex life as a human is already over, without even a final human orgasm to show for it.