earthworm in dirt

Is it Harmful for a Dog to Eat Worms?

We received a question on the All About Worms Facebook page about worms that are harmful to dogs. The question was actually a bit more specific than this, taking the following form: “Can this worm be deadly to dogs if ingested?” Unfortunately, “this worm” is left undefined. No picture is given, and no information about the worm is supplied either. We asked for more information about the harmful or “deadly” worm, but received no further details, so we’ll have to address a broader question: is it harmful for a dog to eat worms?

Generally, questions that involve dogs and worms focus on several well-known canine ailments, such as tapeworm, heartworm, hookworm, whipworms, ringworm, and roundworms. However, we have written about these “dog worms” several times before, and we’ve also written about how you can detect if your dog has worms, so we’ll focus on dogs eating any given worm, not just the worms that are associated with dogs. (For the record, ringworm isn’t a worm, but a skin infection caused by fungus.)

UPDATE! All About Worms has partnered with HealthLabs so that
you can get tested for parasites at a fully-qualified lab near you,
no doctor's visit required
! Check it out at!

We’ll begin by stating the obvious: it is harmful if your dog eats any of the worms (or worm eggs) that are known to cause canine health problems. For instance, if a dog ingests a tapeworm, or some insect (like a flea) that carries tapeworm, this will obviously cause problems. A dog essentially never has the occasion to eat a live worm that directly causes these routine health problems for dogs – again, a dog would generally get tapeworm from a flea, or heartworm from a mosquito – but we just want to cover all our bases. We should also state that we are not veterinarians, so nothing we say should be construed as professional medical advice for dogs. Only a vet can provide that, and if you have concerns about your pet, it is always advisable to visit a professional.

We suspect the reader might be wondering about her dog eating something like an earthworm, which is by no means unheard of. Dogs eat all sorts of random things they find outside, and it isn’t particularly out of the ordinary for a dog to pull something like an earthworms out of the ground to eat it. While an earthworm (or a similar worm) might not be harmful in and of itself, any worm could potentially be harmful to your dog because of what the worm carries within it. For instance, an earthworm will not only contain lots of different bacteria that could be harmful to your dog, it might also carry something that is definitely harmful to your dog, like roundworm eggs. Indeed, roundworm eggs should probably be a dog owner’s number one fear if their dog eats worms. Roundworms lay eggs prolifically, and these eggs are passed by animals (domestic and wild) in their feces all the time. These eggs therefore end up in soil, which can be ingested by a worm and then transmitted to your dog, according to the American Kennel Club. Thus, it is inadvisable for your dog to eat any sort of worm, not necessarily because the worms themselves are harmful (although they could be), but because of what may be in or on the worms.

So, the answer to the question we posed at the beginning of this article is this: yes, it could be harmful for dogs to eat worms, depending on other factors. This isn’t necessarily to say that the worm our reader asked about (whatever worm this may be) is “deadly” to her dog. Indeed, worms that afflict dogs are eminently manageable in the modern era, provided you follow suggested health guidelines (again, we are not veterinarians and you should seek those guidelines from your veterinarian) and take your pet to the veterinarian whenever it is presenting worrying symptoms. Obviously, though, this is no excuse to be reckless with your dog, and you should protect them from themselves whenever possible.

No Paywall Here!
All About Worms is and always has been a free resource. We don't hide our articles behind a paywall, or make you give us your email address, or restrict the number of articles you can read in a month if you don't give us money. That said, it does cost us money to pay our research authors, and to run and maintain the site, so if something you read here was helpful or useful, won't you consider donating something to help keep All About Worms free?
Click for amount options
Other Amount:
What info did we provide for you today?:
Is it Harmful for a Dog to Eat Worms?
Article Name
Is it Harmful for a Dog to Eat Worms?
We received a question about what worms are harmful for dogs to eat.


  1. My 3 lb mini schnauzer, one year old, vomited up a grub looking worm. She immediately got rapid heartbeat and was limp as a rag doll. She could move her eyes but nothing else. I placed her in my husbands lap, a few minutes later she lost total control of her bowel while laying limply in his lap. After about 20 minutes she began to feel better, moving her head. About 3 hrs later she walked down steps to go pee and then to bed. This morning she is playful and active, just not as rambunctious as usual. Do you think maybe the worm is what made her sick? Do you think there could be any serious organ damage as a result?

  2. jenny coote

    my dog ate a earth worm then bought the whole thing up . Any harm to her do you think ? or us . She spends most of the time with us

  3. darla

    my rescue eats worms. She was a starving street dog and i put it up to her former life. She is chubby and happy with me but she still likes to dig after a good rain. She is much happier if i throw kibble in her bed so she can hunt for it.

Leave a Comment (but to submit a question please use the "Submit a Question" link above; we can't respond to questions posted as a comment)

Menu / Search

All About Worms