When your wolf dies it drops its collar, this is fireproof, which will help you in a recharged respawn anchor by doing shift plus right click with the collar in hand you can revive your pet by consuming a recharge of the respawn anchor. Your pet will now be a zombie, which makes it have more life and strength but it will be slower and will burn in the sun. You can cure it from zombification by throwing a potion of weakness at it and then giving it some meat. If your pet in zombie form dies it will drop its collar again, but when it respawns it will be in the form of a skeleton, which makes it have less life than your original pet, it burns in the sun and when it dies it will no longer drop the collar, this version no longer has a way to be cured
