Most dogs will kill a rat but won’t eat it. The chase and kill are driven by prey drive, an instinctive sequence hardwired into dogs through thousands of years of evolution. But domestication has blunted the final step of that sequence, so the majority of pet dogs lose interest once the rat stops moving. Some dogs do eat their catch, though, and that’s where real health risks come in.
Why Dogs Kill Rats but Usually Stop There
Prey drive in dogs follows a predictable chain: hunting, stalking, chasing, catching, and finally consuming. In wild canids, the whole sequence ends with a meal. Domestic dogs, however, typically only run through the first few stages. They’ll track the rat, give chase, shake it, and drop it. The “consumption” phase has been largely bred out of pet dogs over generations of reliable feeding by humans.
This is also why your dog might proudly present a dead rat to you rather than sneak off to eat it. The kill itself satisfies the instinct. The rat was never really about food. It was about the chase.
That said, not every dog stops at the kill. Dogs with exceptionally strong prey drive, dogs that are hungry or under-fed, and certain breeds with deep ratting histories are more likely to eat part or all of a caught rat.
Breeds That Were Built to Catch Rats
Some breeds were specifically developed to hunt and kill rodents. Rat Terriers, as their name suggests, were bred as compact, muscular exterminators. The breed name is said to have been coined by Teddy Roosevelt. Jack Russell Terriers, Cairn Terriers, Dachshunds, and Yorkshire Terriers all share this ratting heritage. These dogs tend to have an intense, hair-trigger prey drive that kicks in the moment they detect a rodent.
Terrier-type breeds are more likely to follow through on the full prey sequence, including eating the rat, because the instinct runs deeper and stronger. Even well-fed terriers may consume prey simply because the drive overrides any lack of hunger. If you own one of these breeds and live in an area with rats, the odds of your dog catching one are significantly higher than with, say, a Labrador or a Bulldog.
What Happens If Your Dog Eats a Rat
A dog that actually eats a rat faces several health risks that a dog who merely kills one largely avoids.
The biggest concern is parasites. Rats serve as intermediate hosts for a range of parasitic organisms that can infect dogs. These include roundworms that cause a condition called visceral larva migrans, tapeworms, and hookworms. One particularly dangerous tapeworm uses rodents as its intermediate host and can cause a severe condition called echinococcosis in both dogs and humans. These parasites set up shop in your dog’s gut, liver, or other organs and can take weeks to produce noticeable symptoms.
Bacterial infections are another risk. Rats commonly carry the bacteria that causes leptospirosis, shedding it in their urine. Dogs can pick up this infection through ingestion, through broken skin, or through contact with mucous membranes like the eyes, nose, or mouth. Killing and mouthing a rat can be enough for exposure even without eating it, but swallowing the rat increases the dose significantly.
One risk you can worry less about: rabies. Small rodents including rats, mice, and squirrels rarely carry rabies and are not known to have transmitted it to other animals or humans.
The Hidden Danger of Rat Poison
If the rat your dog caught had recently eaten rodenticide bait, your dog can be poisoned secondhand. This is called secondary or relay intoxication. A retrospective study of 349 confirmed rodenticide poisoning cases in dogs noted that secondary poisoning from eating intoxicated rodents is possible but uncommon. “Uncommon” is not the same as “zero risk,” though, especially if you live in an area where neighbors or pest control services use bait stations.
The tricky part is timing. Symptoms of rodenticide poisoning in dogs can take several days to appear. The most common type of rat poison, anticoagulant rodenticide, works by preventing blood from clotting. A dog exposed to it through a poisoned rat may seem perfectly fine for two to five days before showing signs like lethargy, pale gums, bloody stool or urine, loss of appetite, or unsteady movement. In severe cases, internal bleeding, organ damage, and seizures can develop.
If you know or suspect your dog ate a rat and there’s any chance rodenticide is in use nearby, don’t wait for symptoms. The window for effective treatment is much wider when you act before bleeding starts.
Signs to Watch For
Whether your dog ate the rat or just killed it, monitor them closely for the next 72 hours. The warning signs to look for include:
- Vomiting or diarrhea, especially if it contains blood or unusual coloring
- Pale or yellowish gums, which can indicate blood loss or liver involvement
- Lethargy or weakness that’s unusual for your dog’s normal energy level
- Excessive thirst or urination, a possible sign of kidney stress from leptospirosis
- Tremors, seizures, or an unsteady walk, which suggest neurological involvement
A combination of gastrointestinal symptoms (vomiting, diarrhea) alongside neurological signs (tremors, seizures) is especially concerning and warrants immediate veterinary attention. Keep in mind that some infections like leptospirosis and parasitic infestations may not produce obvious symptoms for a week or more, so even a dog that seems fine in the first few days isn’t necessarily in the clear.
Killing Without Eating Still Carries Some Risk
Even dogs that kill a rat and walk away without eating it aren’t completely safe. The act of biting, shaking, and mouthing the rat exposes your dog’s mouth and any small cuts or wounds to whatever the rat was carrying. Leptospirosis bacteria can enter through mucous membranes. Fleas from the rat can jump to your dog during the encounter. And if your dog licks their paws or face afterward, they may ingest bacteria or parasitic material they picked up during the kill.
If your dog kills a rat, clean their mouth area and paws with warm water as soon as you can. Check for any bite wounds from the rat, since even small punctures can become infected. Keeping your dog current on parasite prevention and leptospirosis vaccination significantly reduces the downstream risks from these encounters.