Tips, Hints and Spoilers For Playing The Pets Game On Tagged.com. If you want or expect someone to buy you as a pet on Tagged you must be accessible to them.
If you're going to add pets, I beg you, players shouldn't have any benefits from them. 
If they'd be a rare reward from a really challenging encounter, it'd be nice, because everyone would know that you've spent some time on this game and you're experienced. And yes, pets broke RotMG.
Buy Program For Cats
Quick Buy Program For Tagged Pets Autobuyer
If you had the best pet or at least good, and took a look on someone without pet you'd see that you're using your abilities 5x more often which is a lot in that game. This game is more about 'get a pet and SACRIFICE everything to feed him' or 'get a pet and buy food for him' than focus on your character (gearing maxing stats etc.). The pets are 'progress' in that game. I have a legendary pet, I know how it looks like and their pet system is awful. First of all Sentinel's ability should be always on top of the Sentinel.