The only problem with pets is that you may find them becoming less and less useful as the game goes on. As stated above, eventually the time it takes for the pet to head up to town and come back becomes so great, you're probably not going to want to rely on this. Also, pets level much slower than the levels of the monsters increase in the dungeon. If you have a decent Charm Magic skill, you'll probably be summoning things that dwarf your pet in combat ability, even if they're the same type of monster. Even after boosting it to a powerful monster with a flawless fish and giving it some powerful rings and amulet, you may still find that Scruffy has degenerated to a glorified pack mule.​