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Glass bottles will work too, but cans will not shatter when dropped. Your dog will be carrying the can sideways. Some beers may provide you options with cans. If you have a smaller dog you may opt to choose a tall can that has a smaller diameter. However, your beer of choice may not be packaged in these bottle-shaped aluminum cans. You want to get the beer cold for now. Your dog may not be accustomed to the temperature of the cold can. If you use a lukewarm to train with, your dog may become distracted by the coldness of the can when attempting to grab the beer from the refrigerator. This training can take some time. There's no need to defrost your refrigerator and freezer during training. Use a cold beer placed on the floor during this exercise. You may want to stick with a carpeted floor at the beginning. If he immediately picks up a can and drops it, then the damage to the can will be minimal. Click and reward when your dog looks at the can. Then click and reward when he investigates the can. Anything that gets him closer to biting or picking up the can. With luck, a can in the middle of the room will be very attention-getting. He may naturally investigate. As your dog investigates the can, he may engage in a number of behaviors. Any behavior that is closer to biting and picking up the can should receive a click and a reward. He may first sniff. Then he may lick. Then he may try to bite the can to carry it to another spot for more comfortable licking.  Your dog may start licking the can profusely. It is cold, and licking the can will provide a very novel experience for him. If he starts doing nothing but lick the can, stop rewarding him for licking the can. If it takes a while to get your dog to bite the can, replace the can with a cold one from the refrigerator. This way he is biting and picking up a cold can instead of a lukewarm one. If you have a "pick it up" command typically used with a ball, use that command to teach the dog to pick up the beer can. Start using a command such as "Bring me a beer" to encourage the on-command behavior. If your dog does bite the can it may be for the purpose of carrying it off for himself. Be sure to have some favorite treats ready to give him when he picks up the can and brings it to you. If the cold can, in and of itself, is a treat to your dog, you will need to find a treat he likes a lot more. Reward him for picking up the can, and, later, for bringing the can to you and releasing it into your hand.  If you regularly play fetch with your dog, use the same command to get him to bring the can to you. This is where carpet comes in handy. If he has trouble picking up the can or drops it when a reward is presented, the can will fall softly on the carpet. If your dog is reluctant to release the can, consider bring the treat closer to his mouth. He will have to release the can to receive the treat. Consider having your dog pick up the can first, while the can is lying on its side, and second, while the can is standing up normally. Most likely the beers will be sitting upright in the refrigerator, so that's the orientation your dog needs to be accustomed to. If your dog fetches your beer but drops it in front of you, do not reward him. Repeat the command and point to the beer in front of you. Reward him only when he puts the beer in your hand or you can expect a lot of shaken-up beers in the future. Once you know he will pick up and bring you a cold can of beer on command its time to move to the real deal. Open the refrigerator door to reveal a low shelf of beers. Put your cans near the bottom where your dog can get to him. Leave enough space so that your dog can reach in with his snout and grab a beer. The fact that the beer is in the refrigerator and not the floor will not be lost on your dog. This is a completely new scenario. Your goal is to activate the same behavior as before but within the new setting. Pointing will help focus your dog's attention, while giving the command will activate the instinct to perform the associated reward-seeking behavior. Click and reward for anything resembling the original behavior. Your goal is to get him to grab the beer from the fridge, and bring it to you. Ignore the fact that he neither opened nor closed the door. You will work on the proper sequence of behaviors later.
Buy beer cans that will fit in your dog's mouth. Place the beer in the refrigerator where your dog can get it. Place a cold beer on an empty floor. Teach your dog to notice the can. Praise your dog for trying to bite the can. Reward your dog for carrying the can to you and releasing it. Open the refrigerator to give access to the beers. Point to the beers and give the command. Reward him for touching, then biting, then holding, and then retrieving the can.