Sometimes dogs will react negatively to a person if there is a physical attribute that bothers them. It could be as random as someone wearing a hat, a shirt color, if they're sporting a beard or wearing glasses, and so on. A new person wearing something they haven't seen before may be unsettling to them.
They Dislike the Way they Act
Dogs can tell if someone is being rude or unhelpful, and if they notice some behavior they do not like, they might not warm up to a person very easily. This is especially true if a new person is rude to the dog's owner, which feels like a personal slight to your canine companion.
A dog who suddenly becomes disinterested in his pack may be experiencing a wide range of emotions, such as jealousy, anxiety or depression. Has anything changed in your home environment recently? Maybe someone moved into your home (or out of it). Maybe you've been taking him for walks less often than usual.
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.
As we all know, the feeling of love is a series of chemicals released in our bodies, known as dopamine and serotonin. A different set of chemicals is released when you feel hatred or resentment towards someone and your dog can sense that too!
When a dog is feeling rejected or unloved, they will try to do everything in their power to make up for it. If they find that nothing is working, there is a good chance that they will become depressed and feel down. When this happens, they will begin to tuck their tail in between their legs.
Certain people's features or movement style may remind your dog of a threat or even seem unfamiliar to your dog, so he feels afraid and insecure. We know that even familiar humans can seem threatening to dogs if they move suddenly or wear a hat.
Many dogs are fearful around people they don't know well. Some people automatically assume these dogs have been abused in the past. Usually, this is NOT the case. Most of the time, if a dog fears strangers, she has simply been under-socialized to them.
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.
While they aren't always apparent to us, dogs demonstrate explicit behaviors that indicate when they might not like us very much or even feel downright uncomfortable and scared around us.
Something in His Environment Changed
A sudden change in his surroundings could cause him to suddenly avoid you or even make him depressed. Did you move, introduce a new person or pet, or make drastic changes to your home? Just the presence of strange noises can cause anxiety in some dogs.
Dog aggression can be related to fear, prey drive, socialization issues, and guarding territory, among other things. Most aggressive behavior in dogs stems from fear and anxiety, rather than the desire to hurt others. A certified animal behaviorist can help you safely deal with your dog's aggressive behavior.
Offer Treats from the Stranger/New Person
This can disarm your dog's upset and help them see the stranger more positively. To make clear what behavior you're after from your dog, only reward them as they take the treats and slowly move closer to the new person.
Sometimes, it can even be hard to know why this is happening. 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.
Don't Force Introductions
If you have a dog who is fearful or uncomfortable around strangers, it's important to reevaluate the expectations you have for your dog. Instead of forcing your dog to meet people, build their confidence by just being near people without having to interact.
Just like their human pals, dogs are likely to choose a favorite person based on a number of factors. Some of these include the person's demeanor, interactions with the dog, and how well the person helps meet their basic needs.
Past Experiences
It's possible that your dog distrusts men because of past abuse. However, this is likely not the case for most dogs, says The Spruce Pets. Simply being startled by a man once before might be enough cause for a dog to develop a fear of all men.
Dogs can resource guard many things – food, high value treats, toys, people, furniture, and even space. I had a client who was sitting on the couch with her dog, and when her husband approached, the dog growled at him. In this case (and typical for this kind of behavior), the dog was resource guarding my client.
If someone is acting anxious, nervous, or hostile, a dog can sense that energy from them. Or if someone is speaking loudly, harshly, or making large and wild gestures and body movements, this tells a dog something too. All of these things signal to a dog about the emotions that a human is feeling.
For this reason, I advise all my clients and students that it is NEVER wise to punish a dog for growling, even by saying “No.” Dogs that are repeatedly punished for growling eventually may not give a warning and immediately escalate to biting.
The symptoms of depression will vary depending on the individual dog and the severity of the problem. There are some key things to look out for, however, including changes in body language during their interactions with people and other pets, decreased appetite, and lethargic behavior.
Dogs are capable of feeling lonely, and as they are a social species this is a very valid concern for owners. Although the ideal situation would be a fellow doggy to keep them happy, there are lots of other ways to keep them calm and content!
They are able to tell when people are feeling sad by reading their body language and facial expressions. So if your dog seems unusually affectionate towards you at a time when you're feeling down on yourself (or someone else), don't be surprised!