If your dog typically growls at strangers, specific people, such as children or men, or when the dog is in an unfamiliar place, the growls are most likely due to fear. A dog may also growl in situations that trigger fears, such as during thunderstorms or fireworks displays.
Typically when a dog sniffs a person they are uncomfortable with, it's due to the pheromones that person is giving off. To the dog, those pheromones may signal a threat or an alarm telling the dog to beware. Humans can also give off pheromones that reek of fear or nervousness to a dog.
Dogs typically bite just one person in the household because they have a bad past experience, aren't well-socialized, or the person doesn't know how to interact properly with dogs. It could also be resource-guarding behavior.
If you catch your dog in a bad mood, and they growl at you, it may be a low rumbling growl, which can mean “leave me alone.” It is best to listen to your pup when they express their desire to be left alone. You may be able to tell more from their stiff body posture.
Dogs also growl at someone when they are afraid. It warns whatever the dog is afraid of that he wants this interaction to stop, and if it doesn't the dog will be forced to protect himself. If your dog is aggressive toward your husband but not you, he may require more socialization time with men.
Threat or Fear
For example, some dogs may suddenly growl when there are strangers or new people in your home because they may feel threatened and are being territorial. Another example is dog growling when they are in an unfamiliar place or when they hear scary sounds such as thunderstorms.
Fear. If your dog typically growls at strangers, specific people, such as children or men, or when the dog is in an unfamiliar place, the growls are most likely due to fear. A dog may also growl in situations that trigger fears, such as during thunderstorms or fireworks displays.
Don't push your dog over his tolerance threshold. Whatever you're doing, just stop. If your dog's growl threshold is near his bite threshold – that is, if there's not much time between his growl and his bite, get safe. If his growl doesn't mean a bite is imminent, stop what you're doing but stay where you are.
Growls are one very clear signal and something that we can act on to prevent problems. Please don't punish your dog for growling. Instead, say a prayer of thanks that you learned he was uncomfortable before something worse happened.
Growling during play does not mean your dog is aggressive. It simply means they're having a great time. Your dog might even growl during a particularly pleasing cuddle or patting session. Many dogs growl talk to communicate contentment or as a greeting.
So, when someone acts negatively or in an unusual way, dogs sense that the person is likely bad. This leads them to want to protect their humans at all costs. We often have bad feelings about other people, but when it comes to telling whether someone is good or bad, your dog ultimately knows best.
Dogs use facial recognition to communicate with each other and human beings may not see facial features in the same way as dogs. When your dog growls at one person and not another, it might be that he sees a feature that is reminiscent of a threat to him in his memory.
Many breeds are very protective, and many dogs have “their person” – so they will have a tendency to growl when someone else is approaching as a way to ensure that their special person stays safe. You may also see the behavior if they are friendly with other dogs and a new, unknown pet comes around.
For example, if a dog doesn't like you, they may find some of your behaviors annoying, especially if you constantly do things that a lot of dogs are known to hate, like getting in their face, hugging them, teasing them, or yelling at them.
There are multiple reasons that a dog may exhibit aggression toward family members. The most common causes include conflict aggression, fear-based, defensive aggression, status related aggression, possessive aggression, food guarding aggression and redirected aggression.
A dog who isn't thrilled with you isn't going to really stick around when you come by. Aside from avoiding eye contact and ignoring you, they may just straight up leave the room. As Cabral told Insider, "Dogs will more often disengage than opt for destructive behavior."
Bottom Line: When your dog growls at you I recommend that you listen to what your dog is saying. Immediately stop doing whatever it is that you're doing and move away.
Straight off the bat you should be correcting your dog's growling and/or snapping with a firm “no” at the onset of the behavior. When he stops growling, reward him with a “good boy”, or in the beginning, a treat if it's handy at the exact moment of training so that he knows what he is being rewarded for.
Frustration and Irritation
Commonly misinterpreted as aggression, your dogs can growl due to frustration as well which is most similar to a pleasure growl. Dogs don't handle irritation very well which is why it is often expressed with low, rumbling growl.
Dogs bark at people for a variety of different reasons, whether because they are excited, frustrated that they can't greet the person, or even worried or uncomfortable about another's presence. If your dog is barking while in your front yard, they may feel protective of their home or be warning others to stay away.
If your dog charges or growls at your spouse, don't punish this behavior. It's like teaching a child never to say “no” when he's scared. Boundaries are important in life, so respect your dog's boundaries too. Instead, your spouse should turn away and ignore your dog.
A dog's aggression can lead to a bad outcome if your dog bites someone. The good news is that a growl or snap is your dog's way of communicating a waning—and your dog is choosing to warn you instead of biting.
Share consequences with her dog for the growling (she kept a leash and prong on the dog while not crated so she could issue corrections) Remove furniture priviledges (couch, bed, etc) until dog is consistently not resource guarding. Have her husband hand-feed her dog all meals, preferably during training exercises.