12 Ways Dog Aggression is Like Cancer
Is your dog aggressive to people and/or other dogs? You’re not alone. It’s the most common serious behavior issue I see in dogs. Dog owners react differently to their dog’s aggression.
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Deciding to euthanize a dog for behavior reasons is one of the most painful choices a dog owner can face. Unlike terminal illness, where the outcome is clear, behavioral euthanasia involves weighing quality of life, safety risks, and ethical responsibility.
As a dog behavior expert, I’ve seen cases where euthanasia was the last—but kindest—option. Let’s discuss when it might be appropriate and how to navigate this emotional and difficult decision.
Cesar Millan, it’s time to apologize to dogs. For years, you’ve pushed these four myths, and now, science is calling for a reckoning.
If you’ve ever watched The Dog Whisperer, you’ve seen Cesar Millan in action, calmly walking a pack of dogs, correcting bad behavior with a sharp "tsst," and preaching about "dominance" and "being the pack leader." His methods look effective on TV, but here’s the problem: most of what he promotes isn’t backed by modern dog behavior science. In fact, some of it is downright harmful.
We all think we know what punishment looks like when it comes to dogs. Ask most people, and they’ll say, “Oh yeah, that’s stuff like hitting, spanking, shock collars, jerking the leash, or prong collars.” And yes, those are all forms of punishment—but they’re not the whole story.
Aggression in dogs is a complex behavior that normally stems from fear rather than inherent hostility. Understanding the root cause of aggression is crucial for effective management and rehabilitation.
Fear is the primary driver of aggressive behavior in dogs. When a dog perceives a threat—be it a person, another dog, or an unfamiliar object—it may react aggressively to protect itself.
Dealing with the death of a dog is one of the hardest experiences we face in life. At least that’s how it has been for me. If you don’t love dogs, you might not understand. The grief is deep, but a poem titled The Rainbow Bridge has offered comfort for over 65 years to grieving dog owners worldwide.
There’s an unspoken reality in the dog world when it comes to treating dogs with aggression issues toward dogs or even humans. It’s the problem of unqualified dog trainers taking on aggression cases they’re just not equipped to safely and properly handle.
The dog training industry is kind of like the Wild West. In most parts of the world, including the United States, literally anyone can call themselves a “dog trainer” or “behaviorist” without a lick of formal education or experience. One day someone is managing a coffee shop, and the next they’re charging $150 an hour to “fix” aggressive dogs with a shock collar in hand and a YouTube certification.
If your dog suddenly starts staring at "nothing," growling at invisible objects, or acting aggressively out of nowhere, you might wonder, is my dog psychotic? While dogs can display behaviors that seem eerily similar to human psychosis, the truth is more complex—and is often tied to medical or environmental causes. Let’s break down what’s really going on when dogs act "crazy" and what you can do about it.
My daughter brought something to my attention recently that I was completely unaware of. If you have a fairly recent model of Apple’s iPhone (iOS 15 or later), you have an automatic dog breed identification tool! With 350 identified dog breeds in the world, this can be pretty handy.
I show you how to use this feature below.
Almost all dog owners have been there—you call your dog’s name, give a command, and… nothing. Your dog acts like they didn’t even hear you. It’s easy to assume they’re being stubborn and get mad at them, but in reality, dogs don’t ignore their owners out of spite. If your dog regularly “tunes you out,” there’s a reason behind it—and the good news is, you can address it.
First off, let me say this—if your dog has had an aggressive outburst to other dogs or even humans, you’re not alone. Dogs, just like humans, can have moments of fear, frustration, and overexcitement. In dogs, these moments can sometimes cause unexpected aggressive behaviors like growling, barking, and lunging. The good news? There are steps you can take to manage these situations and make your dog feel more secure in those moments.
Dogs are seen as our beloved companions—I know I see mine that way—but when a dog bites someone, the legal implications can be significant. I’ve been involved as an expert witness in many dog bite cases, and from that experience I can tell you that you want to do everything you can to, 1) keep your dog from ever biting someone, and, 2) understand your liability as a dog owner.
About ScottScott Sheaffer, CBCC-KA, CDBC, CPDT-KA, is a dog behavior specialist. Scott specializes in the assessment and treatment of fear, anxiety, aggression and phobias in dogs six months and older. Learn More |
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Is your dog aggressive to people and/or other dogs? You’re not alone. It’s the most common serious behavior issue I see in dogs. Dog owners react differently to their dog’s aggression.
Read MoreYou wear that special t-shirt when watching your favorite sports team play; you’ve found that if you don’t, they lose. This is known as superstitious behavior and we all do it. Sometimes we do it intentionally, and sometimes we do it unconsciously.
Read MoreYou’ve probably read numerous stories about what breeds of dogs are most frequently involved in bites to people. Let’s flip that around and see who is most likely to turn up at the hospital with a dog bite wound. Before reading any further, remember that any dog can bite anyone at any time.
Read MoreThis is a question I am asked almost every day. An owner’s dog will lunge and bark at dogs when he is on-leash, yet seems to enjoy being around other dogs while off-leash at a dog park. There are three main components in answering this question: root cause, physical environment and response. I’m going to address these three elements individually.
Read MoreI’m going to reveal a secret technique (well, not so secret anymore I guess) that I use when I evaluate dogs with behavior issues. That technique is a question I ask the dog’s owner as part of my assessment, “How do you discipline your dog?”
Read MoreThe AKC (American Kennel Club) lists the 10 breeds shown below as America’s current most popular dog breeds. Do you notice something interesting about this list?
Read MoreDo you always take your own advice? Of course you don’t and neither do many dog trainers and behavior consultants. Below is a list of things that many dog professionals frequently do with their own dogs that they might not necessarily advise their clients to do.
Read MoreWe’ve all heard the proverb, “Before you abuse, criticize or accuse a man, walk a mile in his moccasins.” If you are ever inclined to question the folks who run our municipal animal shelters because they sometimes have to euthanize dogs, please consider the following.
Read MoreIn the hierarchy of problematic dog behaviors, certainly dogs biting humans is at the top. Let’s define “dog bite” before we go any further. There is a misbelief that a dog bite is not really a dog bite until there is serious injury. The reality is that anytime a dog’s teeth come in contact with a human as an act of aggression, it is considered a bite.
Read MoreFrom 1924 - 1932 experiments were conducted on humans at a Western Electric factory (Hawthorne Works) near Chicago. Henry A. Landsberger coined a term, "Hawthorne effect", that summarized his findings from these experiments.
Read MoreThe following is an email I received that is representative of situations I commonly see when owners may not fully understand the seriousness of their dog’s aggression. The names have been changed.
Read MoreOur dogs do things sometimes that we find crazy and embarrassing. You'll probably find some of your dog's odd habits in the list below of unusual, but common, dog behaviors. They may be weird to us, but they’re normal for dogs.
Read MoreDo dogs instinctively protect their owners? In this short video, Scott Sheaffer, CDBC, CPDT-KA, will provide some answers that may surprise you.
Read MoreI hear some form of the following almost every day, “I’m not worried about my dog biting children; there is no reason to teach my kids about dog safety.” The reality is that the majority of dog bites to young children are from known dogs, e.g., the family dog and neighborhood dogs.
Read MoreExercising your dog is important. Increased exercise for a client’s dog is one of my most frequent recommendations as part of a treatment plan for problem behaviors. There are many misconceptions about how to properly exercise a dog. Below I’ve provided some things to consider when exercising your four-legged friend.
Read MoreDogs provide information about their emotional state through their tails. While happy dogs may wag their tails, sometimes wagging can mean something else. A wagging tail generally indicates happiness with the exception of flagging.
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I want to talk about something a lot of dog owners overlook, but it can make a huge difference in housetraining and behavior issues—properly cleaning up dog accidents. Whether you're dealing with a young puppy or a dog who’s marking in the house, the way you clean up after them matters more than most people realize.
Why Scent Matters More Than the Mess
When dogs eliminate inside, it’s not just an accident; it’s communication. Dogs use scent the way we use text messages. Whether urine or feces, it leaves a calling card: “Hey, this is a place where I go.” And if that message doesn’t get fully erased, your dog might keep going back and “resending” that message.