How to Get a Puppy to Stop Growling when You Pick Them Up
To get a puppy to stop growling when you pick it up, reward it every time it doesn't growl to reinforce its good behavior. For example, if your puppy is quiet when you pick it up, give it verbal praise and feed it a small treat. Alternatively, if your puppy starts growling, say something like “Quiet” in a stern voice. As soon as it stops growling, go back to giving it praise and another small treat. Use this technique consistently, and be patient, since it may take time and repetition to change your puppy's behavior.
Research positive reinforcement. The best way to teach your puppy a command or to teach your puppy that certain behaviors are not acceptable is through positive reinforcement. This simply means praising appropriate behavior instead of attempting to punish inappropriate behavior. You can weed out improper behavior by giving your puppy motivation to behave in the ways that he know will get him praise and treats. Choose a command. One of the most important aspects of training via positive reinforcement is consistency since your puppy will only understand through repetition. The first thing to be consistent about is the word you use to communicate to your puppy that you want him to stop growling. “Quiet” is the most common phrase for this. Once your puppy understands the meaning of “quiet,” you can also use this command for inappropriate barking, whining, and other vocalizations. Always ensure that the puppy isn't actually vocalizing for good reason before issuing the command. Provide treats and praise when you pick the puppy up. If the puppy doesn't start growling as soon as you pick him up, then provide verbal praise by telling him he's a good boy in a soft voice. You should also keep several small pieces of treat in your pocket and give him a nibble-size bite of treat while he remains quiet and docile as you hold him. To ensure that you're not giving puppy too much in the way of treats as you train, use very small pieces—pea-sized even. Stop providing treats if he starts growling. You want the puppy to begin associating the treats with the quiet, calm behavior he shows when you hold him. As soon as the puppy starts growling, stop giving him praise and treats. However, do not put him down. If you also put the puppy down when he starts growling, then he'll begin associating growling with you putting him down, which will only strengthen the behavior instead of eliminating it. Use your chosen command. If you've chosen “quiet” as the command, use it now after you've stopped giving the puppy treats. Use a stern tone but not one that is loud or so aggressive that it will scare the puppy. If you issue the command in a soft tone, then the puppy will only think it's more praise since that's the same tone you use for the positive reinforcement. Only use the command once and then wait for the puppy to stop. Repeating the phrase over and over will only make it harder for the puppy to associate it with the desired behavior. Provide more praise and treats when the puppy stops growling. As soon as the puppy stops growling for several seconds, provide more praise and treats. You may have to wait a minute for the puppy to give up on the growling behavior, but give him more treats and praise as soon as he stops. It won't happen immediately, but the puppy will begin to understand after days (or weeks) or repetitions that you're pleased and give small treats when he's quiet while being held and that all of that positive reinforcement ceases when he growls. End on a good note. Always end on a moment of positive reinforcement. Though you may have to wait for the puppy to stop growling even when you yourself are ready to put him down, always end the training sessions on moments of positive reinforcement. Wait for the puppy to stop growling, give him the praise and treats, and then finally put him back down. To help avoid too much reliance on treats, you can also use other forms of positive reinforcement. For instance, when you're ready to put the puppy down, wait for him to stop growling and then offer him praise and immediately give him his favorite toy to play with when you set him down. Show consistency. Puppies will only learn the behavior if you show extreme consistency in providing and taking away the positive reinforcement. Mixed messages does not work in puppy training. Be diligent when it comes to providing the puppy with praise, treats, and his toys for displaying the proper behavior. This means that everyone in the household has to do their part in the training process as well. Your puppy won't learn if you're the only one trying to teach. Ensure that everyone who handles the puppy uses the same process of providing positive reinforcement. Have patience. Some puppies may catch onto the command after only a few repetitions, whereas other puppies may need weeks to catch on. Have patience because with consistency, the puppy will eventually learn. Never get so frustrated that you scold or swat the puppy. Dogs understand when you're angry at them but rarely why you're angry, so punishments can confuse your dog. Stick with positive reinforcement. Reduce the dependence on treats. As your puppy learns what behavior you expect of him when he's held and when you issue the “quiet” command, you can reduce the frequency at which you provide treats for obedience. While you should decrease the dependence on treats, always continue remaining consistent with other forms of positive reinforcement, especially praise. Initially, provide a treat four out of every five times that your puppy obeys and displays the correct behavior. As he begins responding regularly to the “quiet” command, then reduce to three out of five times and continue reducing at slow intervals. When your puppy fully understands and consistently obeys all the time, you can reduce to only providing an occasional treat. Vary the reinforcement schedule. Your puppy is smarter than you may realize, and he'll catch on if you consistently provide treats every other time, which can lead to him only obeying every other time. Use a schedule that'll keep him trying to please you and receive his treats. Hold the puppy properly. Your puppy may simply be growling because he doesn't like the way you pick him up or because you hold him in an uncomfortable manner. Though common, puppies do not like being picked up under the arms and lifted that way. It can even hurt the puppy. Instead, put one hand on the puppy's chest and stomach and use the other hand to scoop him up by his rear end. This is a safer way to pick up the puppy. When holding, cradle the puppy into your chest or abdomen to help the puppy feel safe and secure. Pay attention to the frequency of the growling. If your puppy is growling at everyone, then consider that he just might not like being picked up. Dogs are meant to be running around and exploring. It is not natural or normal for dogs to be carried and the puppy might feel uncomfortable being handled in this way. It may be more of a fearful reaction at the situation than an aggressive reaction. Deflect the behavior with a toy. If your puppy is fine with you picking him up but begins growling shortly after, then you can deflect the behavior with a toy. Ensure that you give the puppy the toy before he starts growling. Otherwise he can mistake the toy as a reward for the growling. A toy is also a good way to deflect a puppy that is too mouthy—playfully bites at your arms or hands—when you pick him up. Differentiate playful growling in other areas. Your puppy will likely growl at other times in addition to when you pick him up. He may growl when playing with other puppies, when playing with toys, etc. Growling during play is normal, and you may not want to “quiet” the puppy during these moments. If your puppy is bouncing around, has a playful expression with his mouth open, and “play bows”—bounces down into a position with his front paws down and his rear end in the air—then he's simply playing and not trying to shown real aggression or dominance. Dogs growling to express aggression or dominance are much more likely to stare directly at the source, have ears back, and mouths tight—possibly while baring their teeth. Aggressive growling will also be accompanied by a dog that's holding very still and is focused. If your puppy ever growls when someone else approaches him as he eats, then he's showing signs of food-related aggression. Contact a certified animal behaviorist in your area to help eliminate aggressive behavior related to food. Consider seeing a professional trainer. If after several weeks of training, your puppy still hasn't gotten the hang of the command and still growls, then look into professional training. A trainer will examine how you've been issuing the command and correct any inconsistencies that may be confusing your puppy. 
Research positive reinforcement. Choose a command. Provide treats and praise when you pick the puppy up. Stop providing treats if he starts growling. Use your chosen command. Provide more praise and treats when the puppy stops growling. End on a good note. Show consistency. Have patience. Reduce the dependence on treats. Hold the puppy properly. Pay attention to the frequency of the growling. Deflect the behavior with a toy. Differentiate playful growling in other areas. Consider seeing a professional trainer. 