Ivermectin dosing for dogs is calculated by weight at 0.0015–0.003 mg per pound (1.5–3 mcg/lb) and must be used under veterinary supervision due to toxicity risks, especially in MDR1-mutant breeds.
How much ivermectin can I give my 70 pound dog?
Give 0.105–0.21 mg (105–210 mcg) of ivermectin for a 70 lb dog, or 0.0015–0.003 mg per pound of body weight.
That range matches the standard heartworm-prevention dose vets use every month. Stick to products made for dogs—never cattle or horse formulas. If you're using liquid ivermectin, measure with a syringe for accuracy. The American Kennel Club suggests double-checking the concentration (for example, 1% = 10 mg/mL) before you dose. Don't go beyond that range unless your vet says it's okay.
How much ivermectin can I give my 40 pound dog?
Give 0.06–0.12 mg (60–120 mcg) of ivermectin for a 40 lb dog, based on 0.0015–0.003 mg per pound.
Here's the thing: dogs with the MDR1 gene mutation can react badly even to tiny amounts. According to the VCA Hospitals, collies and similar herding breeds are the most sensitive. Get a simple cheek swab test from your vet to check your dog's MDR1 status before you use ivermectin.
How much ivermectin can I give my 50 pound dog?
Give 0.075–0.15 mg (75–150 mcg) of ivermectin for a 50 lb dog, following the standard 0.0015–0.003 mg/lb dosing guideline.
Don't grab that injectable livestock stuff by mistake. Canine ivermectin is dosed in micrograms per pound. If you're using a 1% solution (10 mg/mL), 0.075 mg equals just 0.0075 mL—less than a single drop. Go over that, and you risk neurological side effects. PetMD points out that even a little extra can trigger tremors or seizures.
Can I worm my dog with ivermectin?
Ivermectin is not FDA-approved for routine deworming in dogs and is only recommended for specific parasites like heartworm, demodectic mange, or sarcoptic mange under veterinary supervision.
It works on certain internal parasites (think Dirofilaria immitis, Demodex, or Sarcoptes), but it's not a broad-spectrum dewormer. The American Veterinary Medical Association (AVMA) suggests fenbendazole or pyrantel for routine intestinal worms. Use ivermectin only for approved uses or exactly as your vet directs.
How do you give a dog ivermectin?
Administer ivermectin orally (PO) once daily at 0.6 mg/kg for mange or monthly at 0.006 mg/kg for heartworm prevention, depending on the condition being treated.
For liquids, use a pet-specific syringe to avoid mistakes. Tablets can go down easier with food to cut down on stomach upset. If your vet prescribes injectable ivermectin (sometimes used off-label for mange), it has to be given under the skin by a professional. Never inject ivermectin meant for oral use. Follow your vet's schedule exactly and watch for side effects like tiredness or shaking.
How much ivermectin do I give a dog with sarcoptic mange?
Treat sarcoptic mange with ivermectin at 300–600 mcg/kg orally once weekly for 4–6 weeks, or until two consecutive negative skin scrapings.
For easier measuring, dilute 1% injectable ivermectin with propylene glycol to 100 mcg/mL, then give 0.3 mL per 10 lbs. A 30 lb dog would get 0.9 mL of the diluted solution once a week. The Merck Veterinary Manual says keep treating even after symptoms fade to make sure the mites are gone. Topical selamectin or moxidectin might be safer choices for sensitive breeds.
Can golden retrievers take ivermectin?
Golden retrievers can safely take ivermectin at heartworm-preventive doses, but those with the MDR1 mutation are at risk of toxicity even at low doses.
Most goldens handle the usual monthly dose (around 0.006 mg/kg) just fine, but about 2–3% of the breed carry the MDR1 mutation. A quick cheek swab test can tell you for sure. The ASPCA lists collies, shelties, and Australian shepherds as higher-risk breeds, but any dog can carry the mutation. Always check with your vet and run the genetic test before you give ivermectin.
What happens if you give a dog too much ivermectin?
Ivermectin overdose may cause dilated pupils, tremors, drooling, seizures, coma, respiratory failure, and death without prompt veterinary intervention.
Toxicity usually happens when dogs get more than 2.5 mg/kg or when MDR1-mutant dogs get standard doses. Signs often show up within 6–12 hours. If you suspect an overdose, call your vet or the ASPCA Animal Poison Control Center right away. Treatment may include IV fluids, lipid therapy, and supportive care. The sooner you act, the better the outcome. Don't try to make your dog vomit unless a professional tells you to.
Can you buy ivermectin over the counter for dogs?
Prescription is required for ivermectin in the U.S.; it is not legally available over the counter for pets, though some online pharmacies may skirt regulations.
Veterinary products like Heartgard or Iverhart are FDA-approved and need a prescription. Even generic versions require one. The FDA warns that unregulated products might be fake or contaminated. Always get ivermectin from your vet or a licensed pet pharmacy to keep your dog safe.
Is liquid ivermectin safe for dogs?
Liquid ivermectin is safe for dogs at labeled doses under veterinary supervision, but it is highly toxic to MDR1-mutant dogs even at low concentrations.
Only use products made for dogs, like injectable ivermectin diluted in propylene glycol. Household formulas (like cattle dewormers) pack way more punch and can poison your dog. The VCA Hospitals stress that dilution has to be exact—1% ivermectin diluted 30:1 gives you 333 mcg/mL. Talk to your vet before switching formulas or using liquid ivermectin at home.
How often should I give my dog ivermectin for mange?
For mange, give ivermectin every 7–14 days at 300–600 mcg/kg until two negative skin scrapings are confirmed, typically over 4–6 weeks.
Demodectic mange often needs months of treatment, while sarcoptic mange may clear up in 4–6 weeks. The Merck Veterinary Manual recommends weekly or biweekly doses depending on how bad it is. Don't stop just because the skin looks better. In tough cases, your vet might add topical treatments like amitraz dips.
How do you dilute ivermectin for dogs?
Dilute 1% ivermectin 30:1 with propylene glycol, glycerin, or vegetable oil for oral use—e.g., 0.1 mL ivermectin + 3 mL diluent yields 3 mL of 333 mcg/mL solution.
This lets you measure tiny doses accurately for small dogs. Say a 10 lb dog needs 300 mcg—that's 0.9 mL of the diluted mix. Always use sterile tools and label the bottle with the concentration and date. The FDA-approved injectable ivermectin label warns against using random household products for dilution. Keep diluted solutions in the fridge and toss them after 30 days.
Which dog breeds should avoid ivermectin?
Breeds prone to the MDR1 gene mutation—such as collies, sheepdogs, Australian shepherds, and Shetland sheepdogs—should avoid ivermectin unless tested negative.
These breeds can't clear ivermectin from their brains properly, so even tiny doses can cause problems. The Washington State University Veterinary Teaching Hospital says heartworm-preventive doses can still be risky for affected dogs. A simple cheek swab test ($50–$100) will tell you if your dog is clear. If your dog tests positive, safer options like topical moxidectin can prevent heartworm without the danger.
When should I give my dog ivermectin?
Give ivermectin monthly for heartworm prevention, daily or every other day for demodectic mange, and weekly for sarcoptic mange or other mites—as directed by your veterinarian.
Timing depends on what you're fighting. Heartworm prevention should be year-round in areas where it's common. For demodicosis, daily dosing may be needed until skin scrapings come back clean. The AKC reminds owners to stay consistent with timing so the medication stays effective. If you miss a dose, give it as soon as you remember, but don't double up.
Can I take ivermectin for animals?
No—human ivermectin formulations are not safe for pets, and animal ivermectin should never be taken by humans.
Animal ivermectin has higher concentrations and different fillers than human products. The FDA warns this misuse can lead to serious poisoning. The FDA consumer update makes it clear: animal ivermectin isn't approved for people and can cause severe illness. Always use pet-specific meds and talk to a doctor before using anything meant for animals.
What happens if a dog takes two heartworm pills?
Taking two heartworm pills at once may cause toxicity in dogs, especially those with the MDR1 mutation, potentially leading to neurological symptoms or death.
Heartworm preventives like Heartgard Plus contain ivermectin/pyrantel and are dosed by weight. Doubling the dose could push your dog past the safe limit (0.006 mg/kg monthly). Watch for vomiting, tremors, or seizures. If that happens, call your vet or an emergency clinic right away. The PetMD says most cases recover with early treatment. Keep preventives locked up and out of reach.
Edited and fact-checked by the FixAnswer editorial team.
