A upgrade for dogs

My idea is that the dogs have a backpack, in this backpack the player can put anything in it such as poses, totems and everything he can use, and if the dog has a totem in that backpack it will be used and the dog will be saved, Also, you can give him an enchanted golden apple and the effects can be distinguished from those of the player, for example, if you and the dog have strength, you can distinguish with the dog's head to know if they are your effects or those of the dog, the same. this would appear with negative effects