Your backyard sounds like a science fiction soundtrack, the trees are covered in red-eyed insects, and your dog has decided they are snacks. This scene repeats every summer somewhere in America, and it peaks during periodical brood years when billions emerge at once. Cicadas are nontoxic to dogs, though eating large numbers can cause vomiting, diarrhea, and in severe cases intestinal blockage. One or two cicadas are a non-event. A full gorge is a vet visit.
Can dogs eat cicadas? The short answer
Dogs can eat a cicada or two without harm, since cicadas carry no venom, no sting, and no toxin. The danger is quantity and texture. Cicada exoskeletons are made of tough chitin that dogs cannot digest, so eating many of them irritates the gut and can pile up into a blockage. Discourage the habit, supervise yard time during emergences, and watch for vomiting or belly pain.
The AKC’s veterinary guidance on dogs eating cicadas sets the tone plainly: the insects carry no poison, though gorging creates real problems. That distinction is the whole article in one sentence. Owners tend to land in one of two camps, total panic or total indifference, and both miss the mark. Panic wastes a vet visit on a one-bug dog; indifference misses the forty-bug dog quietly developing a blockage. Count the bugs, watch the dog, and act on what you see rather than on whichever camp’s advice you read first.
Cicadas do not bite or sting, which removes the most dramatic risk at the start. The risks that remain are mechanical and chemical: hard shells, sharp wing edges, indigestible bulk, and whatever the insects picked up from treated lawns. None of those are exotic. All of them are manageable with supervision.
Why the exoskeleton is the real problem
A cicada’s shell is built to survive years underground and a dramatic molt, not to dissolve in stomach acid. The exoskeleton is mostly chitin, the same tough material in crab shells, and canine digestion barely dents it. One shell passes through as expensive-looking roughage. Dozens of shells arrive as an irritant load that scrapes the gut lining on the way through.
The irritation shows up as gastroenteritis: inflammation of the stomach and intestines that produces vomiting, diarrhea, and abdominal pain.
The diarrhea can turn bloody when the irritation is severe, which alarms owners but reflects gut lining damage rather than poisoning. Lethargy and appetite loss follow as the dog’s body diverts energy to the inflamed gut. Most cases resolve once the shells pass, though the passing can take an uncomfortable day or two of loose stool and skipped meals.
Blockage is the rare but serious endpoint. Shells do not break down, so a large enough mass can lodge in the intestines, especially in small dogs with narrower plumbing. An intestinal blockage is a surgical emergency, and its early signs look exactly like bad gastroenteritis: repeated vomiting, no stool, belly pain, lethargy. That overlap is why “ate a lot of cicadas plus vomiting” deserves a vet call rather than a wait-and-see. You cannot distinguish irritation from obstruction at home.
How many cicadas are too many
A few cicadas are fine for most healthy dogs. The trouble starts somewhere in the double digits, though no authority publishes an exact number. Dr. Mark Freeman, a clinical assistant professor at the Virginia-Maryland College of Veterinary Medicine, put it this way in 2021: a pet can eat several cicadas without complications, most dogs find them fascinating, and problems develop when the quantity grows. His advice for a gorge was direct: see the vet promptly and let the severity of symptoms guide treatment.
Dog size moves the line considerably. A Labrador that eats six cicadas has consumed a rounding error. A Chihuahua that eats six has eaten a meaningful fraction of its body weight in chitin. Small dogs also have narrower intestines, so the blockage threshold arrives sooner. There is no published per-pound formula, so use judgment: the smaller the dog and the larger the count, the lower your threshold for calling.
Sensitive stomachs get their own rule. A dog with a history of digestive upset may react to three cicadas the way a sturdy dog reacts to twenty. You know your dog’s gut. If plain dietary changes cause drama, assume cicadas will too, and keep the leash short during emergence season.
Symptoms to watch after a cicada snack
Vomiting, diarrhea, lethargy, appetite loss, and abdominal pain are the five signs that matter. They usually appear within hours of a gorge, as the shells begin their rough passage. Mild cases show one or two signs briefly: a single vomit, one loose stool, then normal behavior. Moderate cases stack several signs over a day. Severe cases escalate instead of fading.
Bloody diarrhea deserves special mention because it panics owners more than any other symptom. Blood in the stool after a cicada gorge usually comes from shell irritation of the colon lining, and small streaks often resolve as the shells pass. Larger amounts of blood, black tarry stool, or blood combined with lethargy mean the vet now, not tomorrow. The same escalation rule applies to vomiting: occasional is watchable, repeated is callable, and anything with blood is urgent.
Abdominal pain is the symptom owners miss most. Dogs rarely cry about belly pain. Watch for a hunched posture, reluctance to move, a tense belly when touched, restlessness, or repeated stretching with the front end down. A dog that will not lie comfortably is telling you something. Pair any of these with vomiting and you have a dog that needs professional assessment, because pain plus vomiting is the classic early picture of obstruction.
The choking and throat risk
Cicada wings and leg spines can catch in a dog’s throat on the way down. The wings are stiff and papery, the legs carry tiny hair-like structures called setae, and a dog that gulps a cicada whole can end up gagging or pawing at its mouth. Most episodes resolve when the dog coughs the piece up or swallows past it, but a lodged fragment in a small dog is a genuine choking emergency.
The setae cause a subtler problem too. Those microscopic leg hairs can irritate the mouth and throat lining, producing drooling and repeated swallowing even when nothing is stuck. Some dogs develop an itchy reaction around the muzzle after mouthing cicadas, which looks alarming but usually fades within hours. True allergic reactions are rare but documented: facial swelling, hives, or breathing difficulty after insect contact mean emergency care, the same as any anaphylaxis.
Supervision is the practical fix. Dogs do most of their cicada hunting unsupervised in the yard, which is exactly when gulping happens. During peak emergence, treat yard time like you would a yard with a chewable hazard in it: present, watching, and ready with a leave-it. It is a few weeks of vigilance, not a lifestyle change.
The shellfish allergy connection
Dogs with shellfish allergies may react to cicadas, and this is the angle most articles skip. Cicada exoskeletons contain proteins similar to those in shrimp and crab shells, close enough that entomologists who handle insects develop shellfish-like allergies, and the FDA advises people with shellfish allergies not to eat cicadas. The cross-reactivity is a human-food warning, but the biology does not stop at species lines.
If your dog has a diagnosed shellfish or insect allergy, treat cicadas as a known risk rather than a curiosity. Signs mirror other allergic reactions: facial swelling, hives, intense itching, vomiting, or in severe cases breathing difficulty.
A dog with no allergy history is unlikely to develop one from a single cicada, but a dog with a history deserves stricter prevention. Mention the allergy to your vet proactively during emergence season so the clinic has context if you call.
This connection also explains a puzzle some owners report: a dog that tolerates cicadas fine one year and reacts the next. Allergies develop over repeated exposure. Each emergence season is another round of sensitization for a susceptible dog. Past tolerance is reassuring but not a guarantee, which is one more reason the “he was fine last time” logic has limits.
Pesticides: the invisible coating on the bug
Cicadas that fed or rested on treated lawns can carry insecticide residue, and dogs that eat them get a dose of whatever the lawn got. PetMD’s guide to insecticide poisoning in dogs lists eating sprayed bugs as a standard exposure route, alongside walking on treated grass and licking paws afterward. The insect does not have to look sprayed. Residue is invisible.
Symptoms of insecticide exposure differ from plain shell irritation: drooling, tremors, weakness, and in severe cases seizures, often arriving faster than digestive signs. If your neighborhood sprays, or you treat your own lawn, keep the dog off cicada duty entirely during and after applications. The product label’s re-entry time applies to the dog too, and then some, since the dog is eating the local wildlife.
Your own yard is controllable; the neighbor’s is not. Dogs that roam or visit other yards during emergence season can encounter treated insects anywhere. When in doubt about a yard’s chemical history, assume treatment and supervise. The ASPCA’s poison control center can advise on specific products if you know what was applied, so note the product name when your lawn gets treated.
What to do if your dog gorges on cicadas
Remove the dog from the bug zone first, then assess. June bugs are another crunchy summer insect dogs love to chase, and they raise the same gorge-and-shell questions. Count roughly how many went down if you saw it happen. Offer fresh water, since hydration helps move shells through. Do not induce vomiting at home: sharp shell fragments coming back up can injure the throat, and vomiting is only useful under veterinary direction. The Pet Poison Helpline can talk you through the decision if your own vet is unavailable.
Watch for four to six hours minimum. Mild single vomit or one soft stool with an otherwise normal dog can be monitored at home. Escalate to a call if vomiting repeats, diarrhea turns bloody, the belly looks painful, or energy drops. Escalate to emergency care for unproductive retching, a hard distended belly, collapse, or any breathing trouble. Write down the time, the estimated count, and the symptoms in order; vets work faster with a timeline than with a panicked summary.
For the recovery phase, a short bland diet of plain rice and boiled chicken gives the irritated gut an easy day or two. Reintroduce normal food gradually once stools firm up. Most dogs are back to normal within 48 hours. Dogs that needed IV fluids or anti-nausea medication follow the vet’s discharge plan, which usually includes the same bland approach with a slower timeline.
Brood cycles: when to expect the next invasion
Periodical cicadas run on 13- and 17-year clocks, and the calendar tells you when to prepare. Brood XIX, a 13-year brood, and Brood XIII, a 17-year brood, emerged together in 2024 across the Midwest in a co-emergence that made national news and sent dog owners scrambling. Annual cicadas, the “dog-day” cicadas, appear every summer in smaller numbers and keep the question alive between brood years.
Emergence timing follows soil temperature: when the ground 8 inches down hits about 64 degrees Fahrenheit, the nymphs come up, usually in May. The above-ground phase lasts four to six weeks, which is your supervision window. After mating, the adults die, the shells litter everything, and dogs lose interest as the novelty fades. Mark the calendar when the singing starts; the intense period is shorter than it feels.
Dogs add a strange prologue to all this. Many owners report their dogs digging at the yard or staring at the ground weeks before emergence, and they are probably hearing nymphs tunneling upward. Dogs hear frequencies and underground movement that people miss. If your dog starts excavating in April or May in a brood area, the cicadas are coming, and so is your supervision season. It is also worth redirecting the digging early, since nymphs and grubs carry their own soil-related risks, and grass-eating excavations can unearth worse than insects.
When to call the vet
Call your vet for repeated vomiting, bloody diarrhea beyond light streaks, belly pain, lethargy, or any gorge involving a small dog or a large count. Call emergency services for unproductive retching with a swollen belly, collapse, breathing difficulty, or facial swelling suggesting an allergic reaction. A single cicada with no symptoms needs no call at all.
Bring information, not just worry. The vet needs the estimated number eaten, the time since ingestion, the dog’s weight, and the symptom timeline.
Mention lawn treatments if you know of any, and mention shellfish allergies if your dog has them. These details change the assessment: pesticide exposure and allergy history move a case up the urgency ladder fast.
Save the poison control numbers before emergence season starts. The ASPCA’s poison control line and the Pet Poison Helpline both handle insect-ingestion questions, and having the numbers in your phone beats searching mid-crisis. Emergence season is predictable. Your preparation can be too.
Frequently asked questions about dogs and cicadas
Owners usually ask about puppies, shells, timing, and cats. The answers below cover the repeat questions.
Can puppies eat cicadas?
A puppy that snaps up one cicada will almost certainly be fine, but puppies deserve stricter prevention. Their narrower intestines block more easily, their immune systems are still developing, and they gulp without the caution adult dogs learn. Supervise puppies closely during emergences.
Are the empty shells dangerous?
The shed skins, called exuviae, are pure chitin with no soft tissue, so they are the most irritating form. A dog crunching piles of empty shells gets all of the mechanical risk with none of the nutritional content. Sweep shells off patios and play areas during peak weeks.
How long does cicada season last?
The intense above-ground phase runs four to six weeks, usually May into June depending on region. Annual cicadas trickle through summer. Once the singing stops and the shells weather away, the risk ends with it.
Do cicadas bite or sting dogs?
Cicadas have no stingers, and their mouthparts are built for sipping tree sap, not biting. They are defenseless against a curious dog, which is exactly why dogs catch so many.
Can cats eat cicadas?
Cats catch cicadas too, and the same rules apply: not toxic, but the shells can irritate the gut in large numbers. Cats rarely gorge the way dogs do, so serious cases are uncommon.
My dog keeps digging where cicadas will emerge. Should I stop it?
Yes, redirect the digging. Dogs can hear nymphs moving underground before emergence, and excavating exposes them to nymphs, grubs, and soil contaminants. Fill the holes, supervise the yard, and give the dog a sanctioned digging spot elsewhere.
Cicadas are a seasonal management problem, not a poisoning emergency. Keep the count low, the supervision high, and the vet’s number handy during the singing weeks. Most dogs will surf the brood with nothing worse than an interesting afternoon and a mildly off evening.
Disclaimer: This article is for general information only and is not veterinary advice. Every dog reacts differently, and small dogs, puppies, and dogs with allergies or health conditions face higher risks. If your dog shows symptoms after eating cicadas, contact your veterinarian.
