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Are Weasels Dangerous to Dogs?

Weasels are small, stealthy critters that can sometimes cross paths with dogs in backyards or while out hiking. But how dangerous are these feisty mustelids to our canine companions? Do weasels attack dogs?

While weasels tend to avoid direct confrontation, they can inflict nasty bites and potentially transmit diseases if dogs corner or attempt to chase them. Their fierce nature when threatened coupled with infectious bites means weasels do pose some safety risks to curious canines.

In this article, we will answer the question “Are weasels dangerous to dogs?” and provide some tips on how to prevent or deal with a weasel encounter. We will also discuss the pros and cons of keeping a weasel as a pet. Read on to learn more about these fascinating creatures and their relationship with dogs.

What are Weasels?

Are Weasels Dangerous to Dogs

Weasels belong to the Mustelidae family of mammals which also includes otters, mink, martens, badgers, and wolverines.

Some common North American weasel species are:

  • Long-tailed weasel
  • Least weasel
  • Short-tailed weasel
  • Stoat

These long, slender carnivores all share similar behaviors and threats to dogs.

Weasels range from 6 to 18 inches long with muscular, tubular bodies ideal for pursuing prey down burrows and holes. Their coats are brown, tan, or white.

As opportunistic hunters, weasels feed on mice, voles, rabbits, birds, eggs, and other small animals. They kill prey swiftly with a strong bite to the neck.

While not directly predatory toward dogs, weasels can still pose a danger with their infectious bites and aggressive nature when cornered or threatened.

Are Weasels Dangerous to Dogs?

Weasels do not typically initiate deliberate attacks on dogs. However, they can inflict serious defensive bites if threatened by a dog or unable to escape.

Here are some scenarios where weasels may bite dogs:

  • Dogs cornering/chasing a weasel that then turns to defend itself
  • A weasel defending a den of young from a dog
  • Pet dogs disturbing a weasel nest while exploring outside
  • Weasels hiding in woodpiles or brush that get startled by a dog
  • Tussles over prey items both try to claim

While not looking for trouble, weasels won’t back down if they feel trapped or that a dog is encroaching on their territory or food source. Their sharp teeth can cause deep puncture wounds and vicious bites to the face or neck.

So while outright attacks are rare, weasels will bite defensively and their bites can do serious damage. It’s best to be aware of their potential risk and take preventative measures when dogs and weasels cross paths.

Are Weasel Bites Dangerous?

Beyond just a painful bite, weasel attacks on dogs also pose two main health threats:

1. Infection

Like most carnivores, weasels harbor a lot of harmful bacteria in their mouths from eating raw meat. This bacteria can be transferred in a bite leading to infected puncture wounds, abscesses, and potential sepsis.

Weasel bites often go deep thanks to their needle-sharp teeth. These deep puncture wounds sealed under the skin provide the perfect environment for bacterial infection to develop.

Signs can include: swelling, redness, oozing, heat, pain around bite site, fever, lethargy, and loss of appetite.

2. Rabies Transmission

Weasels are one of several wildlife species susceptible to the rabies virus. While not extremely common, rabid weasels do occur and can transmit this deadly virus through their saliva via a bite.

According to the CDC, around 247 cases of rabies in weasels were reported in the U.S. over the past decade.

If a weasel with advanced rabies bites a dog who then develops symptoms, the outcome is nearly always fatal once clinical signs appear. Rabies is a medical emergency requiring swift action.

For both infection and rabies risks, weasel bites demand close veterinary attention to protect your dog’s health.

Weasel Behaviors to Watch For

Weasels give some warning signs that they are feeling threatened before attacking. Being able to read their body language can help prevent bites.

Here are some weasel behaviors that signal they are preparing to defend/attack:

  • Hissing
  • Growling/snarling
  • Stamping front feet rapidly
  • Arching back
  • Fluffing out fur to appear larger
  • Charging forward suddenly
  • Prolonged eye contact/staring
  • Lunging at a dog

If you notice these aggressive cues, call your dog away immediately to a safe distance. Try to remove your dog from the area as soon as a weasel is spotted. Prevention is key to avoiding conflict.

Protecting Dogs From Weasels

While weasel attacks are uncommon, here are some tips to reduce risks when out with your dog:

  • Keep your dog on a leash in areas weasels inhabit like brushy fields. Don’t allow chasing.
  • Carry dog-safe pepper spray to deter weasels who still approach or act aggressively.
  • Give weasels an escape route. Don’t corner them against fences or other barriers.
  • Avoid excessively harassing burrows or dens a weasel may be using.
  • Keep dogs current on rabies shots to reduce severity if a rabid weasel bite occurred.
  • Seek prompt medical care if your dog is ever bitten to treat infection and assess rabies risk. Report bites to authorities.

With smart precautions, dogs and weasels can respectfully co-exist without confrontation when sharing outdoor space. But never underestimate the fierceness of these tiny hunters!

How Dangerous are Other Mustelids to Dogs?

Weasels are not the only mustelid species to occasionally cause harm to dogs. Here is how other mustelid encounters could play out:


These burrowing giants will ignore dogs unless their den is threatened. Cornered badgers fight viciously, delivering dangerous bites.


River otters are not aggressive but can bite dogs swimming in their waters that get too close to pups.


Mink react aggressively when threatened, biting ferociously. Their bites can transmit Aleutian disease to dogs.


Wolverines avoid confrontation but will stand their ground against dogs if challenged, biting severely.


Fishers are not prone to attack dogs but will defend themselves fiercely if cornered, chased, or threatened.

In general, mustelids are not hunting dogs for food. But all are equipped with sharp teeth and infectious bites to defend themselves if pressed. Caution should be taken around these feisty mammals.

What to Do if Your Dog is Bitten by a Weasel

If your dog is unfortunately bitten by a weasel, here are the steps to take:

  1. Leash your dog and remove them safely from the area immediately.
  2. Muzzle your dog to avoid any bites if they snap due to pain.
  3. Clean the bite wound gently with soap and water if possible. Apply pressure to stop bleeding.
  4. Contact your vet to have the bite examined and treated for infection as soon as you are able.
  5. Alert animal control about the weasel bites so they can monitor for rabies outbreaks. Provide details like location.
  6. Monitor your dog closely for any signs of infection or rabies over the next several weeks. Seek prompt medical care for concerning symptoms.
  7. Update your dog’s rabies vaccine as recommended by your vet.

With proper care under your vet’s supervision, most dogs recover fully from weasel bites. But rapid treatment is crucial to prevent long-term complications.

Are Weasels Afraid of Dogs?

While weasels may deliver fierce bites if confronted, they actively try to avoid close encounters with dogs whenever possible. Here’s why weasels are wary of canines:

  • Dogs are much larger predators that see weasels as prey.
  • Weasels’ main defense against predators is hiding, sneaking, and escaping undetected. Openly fighting a dog risks injury or death.
  • The smell of dogs alerts weasels to avoid the area and retreat to safety. Their sense of smell is acute.
  • Weasels are outmatched if cornered by a dog due to substantial size differences.
  • Dogs travel closely with humans, increasing the threats weasels face.

Weasels’ best strategy for staying safe is stealthily avoiding detection and removing themselves from risky situations. Unless defending a den, weasels are likely to flee from approaching dogs vs. attacking.


Weasels have a notorious reputation as fierce fighters on the defense. While not prone to seeking out dogs as prey, they can certainly deliver painful and infectious bites if threatened or cornered. Their small size allows them to easily slip away undetected, but weasels may turn aggressive if a dog pursues and traps them.

While direct attacks are uncommon, it’s wise to be cautious and remove your dog from any weasels you spot to prevent confrontations. Weasels do pose risks from their sharp teeth and potential to carry diseases. But in most cases, both weasels and dogs want to avoid conflict.

With proper precautions like leashing dogs near weasel habitats, you can co-exist peacefully with these fiery mustelids sharing the same space. While a feisty force to be reckoned with, weasels will nearly always choose the path of escape versus attack when given the chance. Respect their space, and they will respect yours in return.

Frequently Asked Questions

Will a weasel attack a large dog?

No, it is highly unlikely a weasel will directly attack or initiate a fight with a large dog. Weasels weigh under 2 pounds while large dogs can weigh 50+ pounds. Weasels will try to escape rather than directly engage.

Are weasels aggressive to dogs?

Weasels are not naturally aggressive toward dogs and will try to avoid them. However, weasels will show aggressive behaviors like growling, stamping, lunging, and biting if they feel trapped by a dog or if their den is being threatened.

Do weasels eat small dogs?

No, weasels hunt prey like mice and rabbits that are much smaller than themselves. A weasel would not be capable of killing a live, adult dog of any size. They do not see dogs as typical food sources.

Can a weasel kill a dog?

It would be extremely unlikely for even a large weasel to kill an adult dog. Weasels are much too small to be able to fatally wound most dogs. The biggest threat is infection from bites. However, very small puppies and toy breeds could potentially be killed in rare cases.

Are dogs good for keeping weasels away?

Yes, the scent and presence of dogs can help deter weasels from frequenting a property. Weasels aim to avoid dogs whenever possible, so having dogs around makes the area less appealing to them. Using dogs to discourage weasels is much safer than trying to eradicate them directly.

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