Not thinking much of all the changes that have happened to you, you continue to act like a dog. I mean, you may walk on all fours, have paws and a muzzle now, but those are all things that happen with puberty, right?
Bored, you decide to head outside to the back yard through the doggy door with a chew toy in your mouth. Man, these things are fun to chew! No wonder dogs like them so much! After a while, some scents around the yard divert your attention. You then decide to get some exercise in and start running all around the yard. Tired, you decide to head inside to rest, but not before doing your business. Once inside, you hop onto the couch, curl up, and drift off to sleep.
Suddenly, you get a rude awakening from your slumber. *Ding dong!* The doorbell rings. You're suddenly filled with the intense desire to run towards the noise. You swiftly hop off the couch and spring towards the front door. Once you reach it, you start barking wildly. Normally it would sound like someone imiatating a bark, but what comes out of your mouth instead sounds like an actual dog bark! Your vocal cords must have changed along with these puberty changes! However, it seems like there is more to come as short after this realization, your entire body starts to feel...itchy. You scratch all over your body with your hind legs but nothing seems to be doing the trick. Now, it feels like the light fuzz on your tail is getting thicker. You swing your head around and watch as your tail gets enveloped in thick dark and light brown fur. Amazed, you notice that the fur didn't stay at your tail, it begins spreading throughout your entire body. It inches its way up your hindquarters and down your legs. Eventually, the fur reaches your crotch. You shift uncomfortably as light brown fur covers your balls. Starting to pant, you feel your dick start to retreat into something and change. Looking down at it, you notice your dick now resides in a furry sheath, having turned red and pointy. The fur starts making its way up your back, down your front legs, and up your neck. It seems to have paused. Investigating your body, it is now covered in fur from the neck down. But, it seems the changes aren't close to over, as your ears starts to tingle. You feel them gradually become pointy and move to the top of your head. Your hearing has become much sharper, as you hear things you weren't able to before. This new sensation, however, is cut short as your head starts pounding with the worst headache you've ever felt.
You whine as the headache continues. Suddenly, your skull starts to reform itself to one more befitting of a dog. Feeling the bones creak and pop, you start thinking more and more like a dog as your brain also slowly changes into a dog's brain.
"Am I dog?" You think to yourself. "No, I human...no human...master....master is human...I...am dog. I am dog." Your mind now fully a dog's, your skull finishes reshaping. The fur once paused at your neck starts growing once more. It covers your ears and slowly works its way across your face and muzzle. Finishing your transformation, you stop being able to see certain colors as your pupils enlarge and your eyes become a dark brown color.
You shake your entire body as the changes complete. Panting away, you stand there, slowly wagging your tail as you wait for your master to get home.