Jack's world went black as he selected enter after changing the sentence to:
"A furry boy Jack has insomnia and is messing with his phone."
Jack woke up to find... nothing different? He scratched his head in confusion and felt something completely new. Jack looked over at his mirror and found that his old ears were gone and two big floppy dog ears were now on his head. He ripped off his sheets to find his legs from the thighs down were covered in a brown fur similar to his hair and ears. His feet were now digitigrade and had pawpads at the bottom of his feet.
"Guess I don't need shoes now..." remarked Jack.
He walked over to his full-length mirror and stripped to see if he had any other changes. Taking off his pants, Jack found a bright red cock with a knot at the base.
"Huh, I have a dog dick now."
Jack didn't notice any other changes besides his teeth felt a little sharper, he had a small tail at the base of his spine, and he could smell his neighbors having a late night BBQ.
This was when his new memories came in. Of course, none of his memories changed much, if at all. His parents were still his parents, nobody knew why he was part dog, and he was even still treated the same. Excited to find this app worked, Jack pulled up another sentence about himself.
"Jack is excited that he was now a dog boy."