Arghhhhhhh... not you, the beeb, dogs haven't evolved to be anything, that's not how evolution works.
Dogs that have characteristics and behaviours that appeal to humans are more likely to be successful since we're selecting for those characteristics in our pets. They're not evolving them for us. Dogs aren't making themselves cute for our benefit, we're selecting dogs that look cute.
Dogs didn't evolve from wolves, they're domesticated wild canids. Certainly dogs, as pets and service animals, wouldn't exist in their current forms unless we had selected for the characteristics in each breed. If humans disappeared, then all those dogs would find themselves in different niches with different selection pressures. They wouldn't go back to wolves, but obviously those with traits that let them adapt to their new environment will survive and those traits will go on the be selected for in subsequent generations.