The ultimate goal of raising a pet is to let the pet learn various pet skills. You can only raise pet in Pet Kennel.
Put the pet into Pet Kennel, choose pet food accordingly to start. Higher level pet takes longer time to raise. When the Satiety level reaches the upper limit, the pet will learn a random skill.
If you're lucky enough to get a Pet Skill Book, you can put your pet into Pet Kennel and use the skill book as food so that the pet can learn the skill successfully.
Initially, +0 pet has skill slot and will get one more slots every 3 levels. You can also use stones to open more slots.
Pet Skill Lock
Pet skills can be obtained by feeding the pet. During skill discovery or learning, if you want to keep an existing skill, you have to use the skill lock to lock the skill to avoid it being replaced.
You can buy a Pet Skill Lock with 28 gold in the mall. Skill Lock can lock 2 skills at most. To lock the first skill needs one Pet Skill Lock, to lock the second skill needs 2 Pet Skill Locks.