20 Dog Breeds That People Should Think Twice About Welcoming Home

So you and the family made the decision to welcome a new four-legged friend into the family. How exciting! You can’t wait to play fetch, go on walks, and get to know your new pooch. But what kind of breed is the best fit for your home? While every dog can be the perfect companion, some prove to be more of a handful than others. Just make sure you do your research before adopting these breeds!

These bags of wrinkles have cute scrunched faces you want to hug tight all day. However, the folds of the wrinkles are prone to collecting bacteria, which can cause a slew of expensive skin issues.

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There are many reasons this breed was chosen to serve alongside police officers: they’re smart, loyal, an obedient. But, to ensure they stay that way, a lot of effort must go into training early on.

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Don’t let the size of these little canines fool you; they can get yappy and act very territorial, especially with younger kids. Train them thoroughly before bringing them home.

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Unless you have a lot of space for these guys to sprint around and work off their incredible bursts of energy, it’s probably best to look elsewhere. They are, however, gentle with people.

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Although these dogs are super gentle, their imposing size can cause issues with young kids; they can easily overpower small body frames. Also, their size leaves them vulnerable to hip dysplasia.

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This breed is incredibly playful, so experts recommend parents make sure their kids learn to be assertive around these pooches. Also keep in mind their flat faces can often lead to breathing problems late in life — and therefore, huge vet bills.

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Get ready to put in a lot of effort training this breed if you want your little companion well-behaved. Without proper guidance, they become Jack Russell Terrors!

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Before bringing these fluffballs home to children, make sure your kids don’t grab at them like plush dolls. Despite how soft and cuddly they look, Pekingnese will lash out if they feel crowded.


Fans of John Wick know just how far Keanu Reeves was willing to go for his beagle. If you’re thinking of getting one, be ready to give it a lot of exercise. If you can’t dedicate much time to running around in the yard, pass on the beagle.

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Yes, the dogs in the Disney films were absolutely adorable, but do some research before you get one of them. Dalmatians can become territorial, which can result in aggressive behavior.

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This breed has the skills to herd sheep on farms, so it’s best to sign them up for a local class (if possible) taught by a trainer to get all that energy out properly. Otherwise, they’ll be looking to herd you, whether you like it or not.

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Thanks to their beautiful fur and eyes, it’s hard not to be mesmerized by every husky that walks by! While they are full of energy, that energy can sometimes result in rambunctious behavior without proper training.

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If you’re looking for a loyal breed who’ll stand by your family through thick and thin, look to the Akitas. However, make sure they know to treat your friends and guests kindly; they may see them as intruders.

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Just because this breed has the word “toy” in its name doesn’t mean these pooches like a lot of attention from eager hands. Toy Spaniels can feel threatened easily, and that can cause them to lash out.

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It’s a shame that pit bulls have such a rough reputation because they’re fantastic dogs if they grow up with love and affection. They are powerful, however, so make sure kids are careful.

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If you’re looking for a dog who loves attention, this is the breed. However, get ready to give Sky Terriers a lot of your undivided attention, or else they might start chewing your home up.

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Don’t let their lavish, flowing look deceive you. These dogs can develop severe separation anxiety, and they aren’t recommended if you have small kids. They scare easily, and that means biting.

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The movie Beethoven put Saint Bernards on everyone’s radar, and for good reason. They’re super friendly, but you must have a lot space before taking one in to avoid inconvenient situations… like having no room on the bed!

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Mastiffs are big, floppy, and peaceful. Their massive size in no way represents their aggression. However, the amount of drool these pups accumulate in a day is enough to fill a punch bowl!

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Typically used to guard livestock, these dogs will attack anything that threatens their “property.” That’s why they’re totally banned in some countries.

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Though Boxers generally only take issue with large dogs of the same sex, boredom can also turn them aggressive. Lack of exercise may result in chewing, digging, and other disruptive behavior.

Although commonly found as police and rescue dogs, Dogos were originally bred as big-game hunters. Combined with their strong opposition to strangers, an untrained Dogo is about as dangerous a dog as they come.

Though decades of breeding have made most Dobermans more gentle in temperament, the breed as a whole was originally bred as a fiercely loyal guard dog. While attacks on owners are rare, untrained Dobermans pose a serious threat both strangers and other dogs.

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While its smiling face would suggest a gentle temperament, Akitas are socially dominant dogs that do not get along with other pooches of the same sex. Without a confident handler, this breed can become highly aggressive and shirk obedience altogether.

Known for their skill at pulling sleds and other freight, Malamutes are closer to their wolf ancestors than most other domesticated dogs. As such, they have a high prey drive, meaning they’re likely to chase and even attack smaller animals.

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A powerful pooch in a small package, Bull Terriers can be incredibly stubborn and independent. If not socialized early on, they can become disobedient and aggressive toward strangers.

The sumo wrestler of the dog fighting world, Tosas are favored in legal Japanese dog fights for their size, power, and aggression. As such, the Tosa is actually banned in countries like Australia, Iceland, and Norway.

Bred as hunting dogs capable of fending off lions, Ridgebacks are also particularly sensitive. If mistreated or trained too harshly, these dogs can become aggressive and lash out.

Originally bred to herd livestock for butchers, Rottweilers have gained a reputation as vicious guard and attack dogs. Their territorial instincts result in aggressive behavior toward strangers, especially when mistreated or not properly trained.

Also known as Brazilian Mastiffs, Fila Brasileiros are bred to be aggressive and are faithful to their masters to a fault. If left alone with a Fila, a stranger may stand to suffer serious injury.

Considered one of the least trainable dogs in the world, Basenjis have high prey drives and generally dislike all non-canine animals. Given the opportunity, Basenjis will chase cats and other small animals, even scaling fences to do so.

A highly protective breed, Caucasian Shepherd Dogs need broad socialization in order to properly get along with other animals. If threatened or perceiving a threat to its master, this breed will not hesitate to make noise or attack.

While Corsos typically pose no threat to their owners, strangers should be mindful to keep their distance from this traditional guard dog. Corsos rarely let anyone other than their masters handle them, making veterinary care a potentially dangerous undertaking.

Originally used by 19th-century gamekeepers to guard estates, Bullmastiffs are instinctively protective of their household. Highly independent, this breed can become aggressive if not trained consistently.

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For some dogs, however, this behavior may actually be caused by rage syndrome. Also known as sudden onset aggression, dogs suffering from this disorder will suddenly attack anyone around them, especially if approached while sleeping.

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Rage syndrome is a genetic disorder. Springer Spaniels are most likely to suffer from this condition, but Dobermans, Poodles, and even Golden Retrievers are known to exhibit symptoms of rage syndrome.


Or, this behavior could be caused by small dog syndrome. Any dog suffering from this disorder will typically become overly aggressive when around other dogs or humans, growling and biting at anything they perceive to be a threat.


Animal experts believe that small dog syndrome is fueled by the behavior of the pet’s owner. If an owner becomes lax with a dog’s training and allows it to get away with things a larger dog would not, this reinforces the bad behavior and may lead to this disorder.


In other species, this kind of aggression could be the result of berserk male syndrome. Another disorder that causes sudden fits of rage, berserk male syndrome causes animals such as llamas, alpacas, and peacocks to attack anything in their paths.

Being around humans from a young age will cause these animals to view their owners as members of their pack, which can become dangerous once the animal reaches adulthood. A territorial animal suffering from berserk male syndrome will attempt to attack anyone who invades their personal space.

Irritable male syndrome is also a common cause of aggression. A disorder typically observed in Soay sheep, reindeer, and other male animals with seasonal breeding patterns, irritable male syndrome occurs as a result of low testosterone levels. Male animals will become nervous and aggressive, attacking almost anything that irks them.

Unsurprisingly, this phenomenon also occurs in human males between the ages of 40 and 60. Considered by researchers to be the male version of menopause, these men are prone to sudden fits of anger, irritation, and hostility.

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Yet not all animal syndromes result in increased aggression. Limber tail syndrome causes a dog’s tail to go completely limp. This disorder occurs when a dog engages in tiring activities or gets exposed to cold water, which prevents blood from reaching the tail and causes it to swell.

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This syndrome is particularly painful for afflicted dogs, and most sufferers will refuse to sit, eat, or even relieve themselves because of the pain. Luckily, the condition isn’t permanent and will usually pass after a few days.

2. Balloon Syndrome: Like the name of this condition implies, balloon syndrome occurs when a hedgehog puffs up so much it begins to resemble an inflated balloon. Scientists don’t fully understand the disorder, but they do know it occurs when air becomes trapped under the animal’s skin.

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Some speculate balloon syndrome may occur as the result of a punctured lung, so when the hedgehog breathes it’s actually sending air under its skin. By puncturing small holes on the body, vets can release this built-up air until the hedgehog’s lungs have fully healed.

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3. Black Dog and Black Cat Syndrome: According to most animal shelters, black dogs and black cats are less likely to be adopted than non-black animals. This is likely due to the fact that dark-colored animals typically lack distinguishing features, making adopters less apt to notice them.


However, this phenomenon may actually be a result of the superstitions surrounding black animals. Black cats are most commonly associated with witchcraft and bad luck, while some believe that black dogs are actually vampires in disguise.

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4. Floppy Trunk Syndrome: The name of this disorder may sound funny, but its effects are deadly for the suffering animal. Floppy trunk syndrome causes elephants’ trunks to go limp, making it difficult for them to eat and putting them at risk of starvation.

This condition is caused by heavy metal poisoning. If an elephant ingests a large amount of concentrated lead – commonly found in dry riverbeds – the nerve endings in its trunk will become paralyzed, rendering the appendage useless.

5. High-Rise Syndrome: This disorder refers to the act of cats falling from great heights. Cats are known to scale tall objects and high places, but doing so puts them at great risk of falling, which happens quite often.

Surprisingly, cats are more likely to get injured from a fall of less than two stories than one of a greater height. This is because falls of more than two stories allow the cats more time to land on their feet, whereas a short fall does not give such luxury.

6. Domestication Syndrome: This syndrome is indiscriminate, meaning that no one species is more susceptible than others. Domestication syndrome is caused by the domestication of an animal, leading to droopy ears, lighters coats, and smaller brains, among other notable traits.

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Russian farmer Dmitry Belyaev was the first to notice this phenomenon after he began domesticating silver foxes in the 1950s. After breeding them through 20 generations, he discovered the foxes had lost most of the traits possessed by their wild counterparts, leaving them docile and ill-equipped.

7. Short-Spine Syndrome: As dog owners, we want to know our furry friends are as healthy and happy as possible. Besides only wanting the best for our beloved companions, caring for animals with health problems can be difficult.

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