Jeff was nervous enough about trying this out, he was sure that he'd never be able to decide for himself. He decided to see what he could do with the random settings.
He pulled up the random dog menu and started looking. He found that he could decide what aspects of his transformation would be random and which would be normal. He selected random breed and an age range of 1-5 years so he wouldn't be a puppy or a geezer. Health level was set at perfect with all shots up to date. He paused at gender and decided to leave that random, too.
He started looking at some of the advanced options after that. He found that he could even alter reality to variable degrees. After checking the help file, he set the machine to make him the family pet, temporarily erasing him from reality, but keeping his memories intact. He did select strong animal instincts, however. Part of him thought that was risky, but if it was temporary it was okay. Besides, set this way, he wouldn't have to explain him being missing.
When he got to the end, he had to decide on time of tranformation. The help file told him that he would automatically turn back into his human self after whatever period of time passed as if nothing happened. His dog self would simply vanish, and Jeff would reappear. and re-enter reality, He found that he could even make this random if he wanted, so he might be a dog for an hour or years!
Holding his breath, he set that final selection and hit the start button....