Get

In Your Inbox

Dogster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Why Is My Dog Becoming Aggressive? 10 Vet-Verified Reasons Explained

angry white pomeranian dog

Aggressive behavior is a serious issue, particularly if you have small children or seniors in your household, as they are the most common victims. Aggression is complicated when it comes to dogs, as it can be a behavioral problem, or it may have internal triggers.

Aggression requires prompt attention and potentially veterinary involvement to determine the cause and means to end this unwanted behavior. Remember that local laws often require or give victims or their guardians the right to euthanize an animal that bites. So, let’s explore some common reasons why your dog is becoming aggressive to see if you can get the behavior nipped in the bud before it becomes a problem.

divider single dog paw oct 2024

The 10 Common Reasons for Dogs Becoming Aggressive

1. Fear-Induced Aggression

Sometimes, a dog acts aggressively out of fear. They have detected a threat and responded the only way they know how. Puppies separated from their mothers and littermates before 8 weeks may be more likely to be fearful of new experiences and people. Those emotions may cause an animal to become aggressive. Fear is one of a handful of emotions dogs experience, developing early in their young lives.

angry cocker spaniel dog
Image Credit: fabio spezia, Shutterstock

2. Pain-Induced Aggression

Pain-induced aggression is similar to our last entry. It’s a survival instinct from an animal that feels vulnerable and threatened. Even the sweetest dog in the world may snap in these situations. The behavior is a red flag of a possible problem worth investigating. We recommend contacting your vet for advice about managing this condition.

Did you know you can talk to a vet online? Click on the image or button below to schedule a call: PangoVet_Mention-in-Content Savings V1



3. Prey Drive

Many enthusiasts raised and selectively bred dogs to be hunters or herding animals. That can add a genetic component to aggression. A dog may instinctively chase a fleeing cat without warning. Likewise, your pet may suddenly go into a guardian or watchdog mode. The aggression isn’t necessarily directed at you or a pet; instinct often controls their response to an environmental stimulus.

german shepherd dog barking
Image Credit: Dyrefotografi, Shutterstock

4. Territoriality

Territoriality can exist in many dogs, particularly in pets who are not properly socialized. Other canines are perceived to be a threat to their family and yard. You may see it in neutered or intact dogs. It’s worth noting that research has shown the latter was most likely to bite, regardless of the sex. You may see this behavior develop as your pet nears sexual maturity.


5. Play Aggression

Play aggression describes roughhousing that has gone too far. Puppies seemingly play rough, particularly when they’re learning about dominance and how to control it. It’s imperative not to encourage this behavior to prevent it from following them into adulthood. Teach your children to avoid tug-of-war or other aggressive play during this stage in your pet’s life.

two dogs fighting outdoor
Image Credit: Alexandr Jitarev, Shutterstock

6. Resource Guarding

Resource guarding is another riff on territoriality. The reason is often a toy or other treat. The dog aggressively watches over something they value and is prepared to defend it. That’s why it’s essential to teach your pet a “drop” command early in their training. It is especially effective when you reinforce the lesson with a treat that they’ll likely value more than the object.


7. Displaced Aggression

There are times when a dog gets angry or upset about something that they can’t do anything about, and instead of being able to take their aggression out on that thing, they take it out on something else. For example, the neighbor dog might take a shortcut across your yard while your dog watches from the window. But instead of being able to bark or growl directly at the neighbor dog, they turn and nip at your cat since they can easily get at the cat while a window separates your dog from the neighbor’s.

cat and dog fighting
Image Credit: Anastasiya Tsiasemnikava, Shutterstock

8. Inadequate Socialization

Introducing puppies to novel experiences and even car rides is critical. They should meet new people and other pets. Research has shown that inadequate socialization can increase fearfulness and its complications in dogs. These pets are more likely to bark at strangers and other animals.


9. Motherly Instinct

Caring for puppies is a stressful time for mothers. Their instincts are in overdrive to protect their young from any threats. Seemingly docile dogs may get in touch with their inner mamma grizzly bear during this time. First-time mothers might be particularly prone to this behavior. The best response is to avoid upsetting the mother. Don’t try to handle the puppies when they are most vulnerable, and trust that your dog knows what she’s doing!

angry mother dog
Image Credit: Bonsales, Shutterstock

10. Medical Causes

Medical issues can cause some sudden behavior changes. Aging can also affect cognitive function. These pets may become more anxious and respond differently to routine occurrences. You may notice other signs of cognitive dysfunction, including inappropriate elimination, irritability, and lethargy. Medical conditions, such as hypothyroidism, can also cause behavioral changes. If you think that there is a chance that something is wrong with your dog, you need to take them in to see the vet as soon as possible.

divider dog paws oct 2024

How to Handle an Aggressive Dog

You should schedule your dog for a thorough exam if you notice any sudden behavioral changes. Many things can cause these issues, making veterinary intervention necessary. If the problem is behavioral and not physical, your vet can refer you to a specialist to help you manage and cope with the condition. The takeaway is not to ignore this obvious sign of something being wrong with your dog.

Remember that many causes are treatable once you have identified the trigger or problem. Part of being a responsible pet owner is providing the necessary care. You can discuss your options with your vet and improve your dog’s quality of life.

divider dog paws 3 oct 2024

Conclusion

Aggression in a loved pet is upsetting for everyone involved. That’s why it’s imperative to act quickly once you notice something is amiss. Sometimes, dogs become cranky because they don’t feel well, with the problem taking care of itself. Other times, you must act. We strongly urge you not to delay. An aggressive pet is a risk to everyone in your household, but a solution may be close at hand.

See also:


Featured Image Credit: leungchopan, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything dog

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Dogster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

200+ Popular & Unique Wirehaired Pointing Griffon Names

Congratulations! You’ve just welcomed a new puppy into the home. Now, what to name them? Chances are, you will want a name that...

11 Requirements to Adopt a Dog From a Shelter: Application, Fees & Considerations

Adopting a dog from a shelter is a rewarding experience that gives a second chance to a deserving animal and helps open resources...

Do Corgis Make Good Service Dogs? Facts & FAQ

The Corgi is an intelligent, keen, and tenacious breed that’s recognizable almost as soon as its unique silhouette is seen. There are two...

Why Does a Dog Twitch in Their Sleep? Should You Worry?

One of the best things about dog ownership is curling up together in the living room at the end of a long day....

More related

Should I Let My Puppy Sleep With Me? Vet-Reviewed Pros, Cons & Safety Advice

You have likely heard that letting your pet sleep with you is a bad idea, and pet experts have maintained this stance for...

Golden Irish Dog Breed: Info, Pictures, Care & More

Golden Retrievers are one of the most popular breeds for families, but many people are worried that retrievers will be too energetic for...

Male vs. Female Shiba Inu: The Differences (With Pictures)

The Shiba Inu has been made famous in North America thanks to the Doge meme, so many people want to learn more about...

Blue Buffalo vs Purina Pro Plan Dog Food: 2025 Comparison

Both Blue Buffalo and Purina Pro Plan are well-known brands that sell a wide variety of dog food. At a quick glance, both...

Keep reading

Aldi Pure Being Dog Food Review 2025: Recalls, Pros & Cons

Review Summary Aldi Pure Being is made with meat as the main ingredient in their foods. The dog food is an excellent option for pet owners on a budget. You can rest assured that the food is balanced and nutritious...

Dogster_Aldi Pure Being Dog Food Review

Can Dogs Eat Pomegranates? Vet-Verified Nutrition Facts & Info

Pomegranate is widely billed as being a superfood for humans, thanks to the diverse range of vitamins and minerals it contains, and the concentration of them. They are particularly known for being high in fiber and potassium as well as...

Dogster-Can-Dogs-Eat-Pomegranates

Blackwood Dog Food Review 2025: Recalls, Pros & Cons

link Review Summary Blackwood is a pet food company founded on the premise that slow-cooking food in small batches preserves the most nutrients, to give your pets nutritionally dense food for energy and stamina. In every bowl of Blackwood pet...

Dogster_Blackwood Dog Food Review

Can Dogs Eat Quinoa? Canine Diet & Health (Vet-Approved)

Quinoa is a gluten-free seed that has been a staple in many human diets for centuries, but has been elevated to prominence in recent years as a natural alternative to grains for health-conscious humans. It is also considered a healthy...

Can Dogs Eat_quinoa

Raised Right Human-Grade Dog Food Review 2025: Veterinarian-Backed Dog Food

In 2016, a new dog food company emerged from one family’s desire to feed their own dogs a better food. Braeden Ruud and his family, concerned about a recent outbreak of dog food recalls, had begun cooking for their pets...

Dogster_Raised Right Human-Grade Dog Food Review

Rachael Ray Dog Food Review 2025: Recalls, Pros & Cons

Review Summary Celebrity chef Rachael Ray has created a line of dog foods that feature some of her best recipes. This is a line of all-natural dog food that is considered to be high-quality and full of ingredients that can...

Dogster_Rachael Ray Dog Food Review

Pros & Cons of Grain-Free Dog Food: Benefits, Risks, & More

Grain-free dog food has been gaining in popularity over the past few years. And while grain-free diets may have some benefits, there are also some potential risks associated with them as well. In this article, we’ll take a look at...

a dog eating from metal bowl

Can Dogs Eat Cat Food? Vet-Verified Info & Safety Tips

When you live in a multi-pet household with dogs and cats, you’re probably used to having to keep your pets from eating each other’s food. Dogs and cats can eat many of the same foods, and a lot of the...

Can Dogs Eat Cat Food