Aspirin Dosage for Dogs

Amber L. Drake
Reviewed by Veterinarian Clare Deming
Dog being examined by the vet; © Erik Reis | Dreamstime.com

Aspirin can be used to treat dogs that are in pain. According to VetInfo.com, while aspirin should never be given to puppies because their systems can't break it down, you can give your adult dog aspirin to relieve pain and/or inflammation, and you should always give it with food. However, before you give your dog aspirin, it's important to understand the correct dosage for your dog, as well as the possible side-effects aspirin can have on your pet.

Correct Aspirin Dosage Chart for Dogs

The following dosage guidelines are provided for informational purposes only and are not meant to replace professional veterinary consultation and care. Consult your vet directly to determine if administering aspirin is the right treatment for your pet and confirm the correct dosage based on your dog's exact weight. As a general guideline, the following table may be utilized:

Aspirin for Dogs (once or twice daily)
Weight Amount of Aspirin Common Dog Breeds
~5 lbs 25-50 mg OR 1/2 baby aspirin Chihuahua, Pomeranian, Chinese Crested
~10 lbs 50-100 mg OR 1 baby aspirin Pekingese, Boston Terrier, Miniature Fox Terrier
~20 lbs 100-200 mg OR 1/2 adult aspirin Miniature Poodle, Pembroke Welsh Corgi, West Highland Terrier
~30 lbs 150-300 mg OR 1/2 to 1 adult aspirin Beagle, Cardigan Welsh Corgi, Border Collie
~40 lbs 200- 400 mg OR 1 adult aspirin Samoyed, Vizsla, Shar-Pei
~50 lbs 250-500 mg OR 1 to 1-1/2 adult aspirin Airedale Terrier, Portuguese Water Dog, Irish Setter
~60 lbs 300-600 mg OR 1-2 adult aspirin Staffordshire Terrier, Labrador Retriever, Golden Retriever
~70 lbs 350-700 mg OR 1-2 adult aspirin American Staffordshire Terrier, Chow Chow, Dalmatian
~80 lbs 400-800 mg OR 2 adult aspirin Akita, Cane Corso, Rottweiler
~90 lbs 450-900 mg or 1-1/2 to 2-1/2 adult aspirin German Shepherd Dog, Bloodhound, Chinook
~100 lbs+ 500-1000 mg OR 2-3 adult aspirin Bullmastiff, Great Dane, Saint Bernard

The recommended dosage is 5 mg to 10 mg of aspirin per pound of a dog's weight, as recommended by your veterinarian, and it can be given once every 12 hours. For comparison's sake, 81 mg of aspirin for dogs is equivalent to one baby aspirin, and an adult aspirin starts at 320 mg. Let your vet know how many milligrams are in the type of aspirin tablet you intend to use, as found on the container label, and your vet will recommend how to cut the tablet down to reach the proper dosage.

Human Aspirin for Dogs?

Your veterinarian may prescribe aspirin designed for humans to your dog such as baby aspirin. However aspirin designed specifically for dogs is the safest choice. Most aspirin varieties made for dogs are buffered in order to protect the dog's stomach. Enteric-coated aspirin, which is different from buffered, does not work well in dogs as they cannot properly digest the coating in time for the aspirin to have a useful effect.

Where to Get Aspirin for Dogs

You can purchase aspirin made specifically for dogs at pet supply stores and other large retailers:

Veterinarian giving a pill to a dog

Side Effects of Aspirin Usage

While aspirin can be effective and is readily available, there are possible adverse side effects, as well as reasons aspirin use is not advisable in some circumstances.

  • Stomach upset - Aspirin can upset a dog's stomach, which can interfere with the ultimate goal of relieving your dog's pain if he throws up the medication. Buffered aspirin is usually easier on a dog's stomach than non-buffered aspirin, especially if your vet advises you to give repeated doses.
  • Stomach ulcers - Long-term usage could lead to stomach ulcers. Watch for dark, tar-like blood in your dog's stools since this is usually a strong indication his stomach has been bleeding.
  • Blood thinning - Aspirin does thin the blood, which can lead to excessive bleeding if your dog is injured or undergoes surgery while on the medication. It should never be administered to a dog with Von Willebrand's Disease or pregnant or nursing dogs.
  • Kidney damage - Aspirin should never be given to a dog that already has kidney disease. In otherwise healthy dogs, watch for signs such as increased or decreased thirst, and well as changes in appetite and onset of vomiting, since these signs are often associated with kidney problems.

Canine Aspirin Overdose Is Possible

Giving your dog too much aspirin can produce serious complications that require emergency care. According to PetMD.com and VetInfo.com, signs of an overdose can include:

  • Lethargy/weakness
  • Anxious or depressed behavior
  • Loss of appetite
  • Loss of coordination
  • Vomiting (Usually blood)
  • Diarrhea
  • Pale gums (Sign of possible shock)
  • Intestinal hemorrhage
  • Rapid breathing/panting
  • Seizures
  • Loss of consciousness

Dogs can also die quite suddenly if they receive a toxic dose of aspirin.

Tips for Giving Aspirin to Dogs

If your vet advises you to use this medication for your dog, the next step is administering the dose your vet has advised. There are several ways to do this.

  • Place the pill on the back of your dog's tongue and stroke his throat to encourage him to swallow.
  • Place the pill inside a special, digestible "pill pocket" used to give dogs medication.
  • Insert the pill inside a tempting food like a piece of hot dog, or wrap it in a piece of bread and feed it to your dog.

Other OTC Pain Relievers

While some over-the-counter varieties of aspirin may be approved for use on your dog by your veterinarian, it's important to remember not all OTC pain relievers are safe. For example, giving ibuprofen to dogs can be fatal. Other common OTC pain relievers that are highly toxic to dogs are acetaminophen and naproxen. Always discuss with your veterinarian any OTC medications prior to using them on your dog. If your dog has pain and swelling there are OTC medications that are safe such as any of the aspirins made specifically for dogs as well as prescription medications from your veterinarian such as Rimadyl and Metacam.

Talk With Your Vet

To avoid harmful drug interactions, you should not give aspirin to a dog that is on any other medications unless you're giving aspirin under the direct supervision of a veterinarian. Ask your vet about alternative pain medications so you can make an informed decision about the best treatment for your pet.

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Aspirin Dosage for Dogs