Method 1: Locking Room Glitch
Step 1: Lock your spare's den, then immediately click on bitter sweets or the play as your pet party on your main.
Step 2: You will be roaming around a typical spawning land as a pet. (The land which you get locked into is random).
You can also be a pet in land by door glitching, but you must be glitching into a land rather than a room. It can't be an underwater land either. If the glitch succeeded, you will be playing as a pet in the land you glitched in.
Effects
Playing a pet-game will switch your pet if you are using the wrong one.
If you did this glitch with bitter sweets, switching rooms will cause you to become adventure-locked to it with these effects. Stuff from the adventure will also spawn in before you switch rooms.
If done with the play as your pet party, you will have the regular menu, but the switch animals button will be replaced by a switch pet button. Switching rooms makes it go back to normal, and you will be an animal again.