Last updated: March 2026
If you’re considering CBD oil for your dog, the first question is usually the same: how much should I give them?
It’s a fair question — and one without a simple universal answer. Unlike prescription medications with standardized doses, CBD dosing for dogs depends on your dog’s weight, the condition you’re addressing, the product’s concentration, and your dog’s individual response.
The good news is that veterinary research on CBD for dogs has advanced significantly in recent years. Several clinical trials have established dosing ranges that are safe, well-tolerated, and effective for common canine conditions like arthritis, anxiety, and seizures.
This guide provides a practical dosing framework based on the latest veterinary research, along with product recommendations and safety information.
CBD Dosage Chart for Dogs
Use this chart as a starting point. Begin at the low end and increase gradually over one to two weeks if needed.
For Mild Conditions (General Wellness, Mild Anxiety, Mild Stiffness)
| Dog’s Weight | Starting Dose | Dose Range | Frequency |
|---|---|---|---|
| Under 10 lbs (4.5 kg) | 1 mg | 1–2 mg | Twice daily |
| 10–25 lbs (4.5–11 kg) | 2 mg | 2–4 mg | Twice daily |
| 25–50 lbs (11–23 kg) | 4 mg | 4–8 mg | Twice daily |
| 50–75 lbs (23–34 kg) | 6 mg | 6–12 mg | Twice daily |
| Over 75 lbs (34 kg+) | 8 mg | 8–16 mg | Twice daily |
For Moderate to Severe Conditions (Arthritis, Chronic Pain, Anxiety, Seizures)
| Dog’s Weight | Starting Dose | Dose Range | Frequency |
|---|---|---|---|
| Under 10 lbs (4.5 kg) | 2 mg | 2–4 mg | Twice daily |
| 10–25 lbs (4.5–11 kg) | 4 mg | 4–8 mg | Twice daily |
| 25–50 lbs (11–23 kg) | 8 mg | 8–16 mg | Twice daily |
| 50–75 lbs (23–34 kg) | 12 mg | 12–24 mg | Twice daily |
| Over 75 lbs (34 kg+) | 16 mg | 16–32 mg | Twice daily |
The golden rule: Start low and go slow. Give your dog the starting dose twice daily for at least five to seven days before increasing. Many dogs respond well to lower doses, and there’s no benefit to using more than necessary.
How to Calculate the Dose from Your Bottle
CBD oil for dogs is labelled by total CBD content per bottle, not per dose. Here’s how to figure out what you’re actually giving:
Step 1: Know Your Bottle’s Concentration
Most pet CBD oils come in 30ml bottles. Divide the total CBD by 30 to get the CBD per milliliter:
| Bottle Strength | CBD per ml | CBD per Half Dropper (0.5 ml) |
|---|---|---|
| 250 mg / 30 ml | 8.3 mg | 4.2 mg |
| 500 mg / 30 ml | 16.7 mg | 8.3 mg |
| 1000 mg / 30 ml | 33.3 mg | 16.7 mg |
Step 2: Measure Against Your Dog’s Dose
Example: Your 40 lb dog has moderate arthritis. The chart suggests starting at 8 mg twice daily. With a 500 mg bottle (16.7 mg per ml), you’d give approximately half a dropper (0.5 ml ≈ 8 mg) twice per day.
Step 3: Adjust Over Time
After five to seven days at the starting dose, assess your dog’s response. If you’re not seeing improvement, increase by 25–50% and hold at the new dose for another five to seven days. Continue adjusting gradually until you find the minimum effective dose.
What the Veterinary Research Says
Arthritis and Joint Pain
A landmark 2018 clinical trial from Cornell University’s College of Veterinary Medicine studied CBD oil for osteoarthritis in dogs. Using a dose of 2 mg per kilogram of body weight twice daily, the researchers found that CBD significantly increased comfort and activity levels in arthritic dogs. Over 80% of the dogs showed measurable improvement in pain and mobility scores. No adverse side effects were reported.
A 2020 study from Baylor College of Medicine tested CBD on dogs with osteoarthritis and found that a dose of 2 mg/kg/day (given as a single daily dose) led to significant improvements in mobility and quality of life. The study used a full-spectrum hemp extract and noted that dogs with the highest baseline pain levels showed the greatest improvement.
A 2022 follow-up study at Cornell confirmed that the 2 mg/kg twice-daily dose remained effective over a 12-week period, with no evidence of tolerance building or adverse liver effects at that dose level.
Seizures and Epilepsy
Epilepsy affects an estimated 0.75% of dogs, and conventional anti-seizure medications can have significant side effects. A 2019 randomized controlled trial from Colorado State University found that dogs receiving 2.5 mg/kg of CBD twice daily experienced a 33% reduction in seizure frequency compared to placebo. The researchers noted that dogs with higher plasma CBD concentrations showed greater seizure reduction.
A 2023 study at the University of Guelph in Ontario found similar results, with CBD reducing seizure frequency by approximately 40% in dogs with drug-resistant epilepsy when used alongside conventional medications.
Anxiety
While clinical trial data on CBD for canine anxiety is more limited, a 2023 pilot study published in Frontiers in Veterinary Science found that CBD at 1.4 mg/kg reduced stress-related behaviours in dogs during car travel. The dogs showed less panting, whining, and restlessness compared to the placebo group.
Many veterinarians report that CBD at the standard 2 mg/kg dose is effective for situational anxiety (thunderstorms, fireworks, separation) and general anxiety, though they emphasize that behavioural training should be the primary approach.
How to Give CBD Oil to Your Dog
Method 1: Directly in the Mouth (Fastest)
Use the dropper to place the oil directly onto your dog’s gums or under the tongue. This provides the fastest absorption — effects are typically noticeable within 30 to 45 minutes. Some dogs accept this easily; others may resist.
Method 2: Mixed with Food (Easiest)
Add the CBD oil to your dog’s food or a treat. This is the easiest method for most dogs, though absorption may be slightly slower (45 to 90 minutes) as the CBD passes through the digestive system. Fat-containing foods can enhance absorption.
Method 3: CBD Dog Treats (Most Convenient)
Pre-dosed CBD treats take the guesswork out of measuring. Each treat contains a fixed amount of CBD, making it easy to dose consistently. The tradeoff is less flexibility in adjusting the dose.
Our CBD treats: Chewy CBD Dog Treats from Doggo — available in chicken and lamb flavours.
Timing
For chronic conditions like arthritis, give CBD twice daily (morning and evening) for the most consistent effect. For situational anxiety (fireworks, car travel, vet visits), give the dose 30 to 60 minutes before the anticipated event.
Choosing the Right CBD Product for Your Dog
THC-Free vs. Full Spectrum
Dogs are more sensitive to THC than humans. While the trace amounts in full spectrum products (below 0.3%) are generally considered safe for dogs, many veterinarians recommend starting with a THC-free CBD oil — especially for smaller dogs or those who have never had CBD before.
If your dog tolerates THC-free CBD well and you want to explore the potential benefits of the entourage effect, a full spectrum pet CBD oil is the next step.
Our Recommended CBD Products for Dogs
Best THC-Free CBD Oil for Dogs: CBD Oil for Dogs — Bacon Flavoured from Honest Botanicals — available in 250 mg and 500 mg strengths. Made specifically for pets with no THC. The bacon flavour makes dosing easy.
Best Full Spectrum CBD Oil for Dogs: Full Spectrum CBD Oil for Dogs — Chicken Flavoured from Honest Botanicals — full cannabinoid profile with trace THC. Available in 500 mg and 1000 mg strengths for larger dogs or higher dosing needs.
Best for Senior Dogs with Arthritis: CBD & Glucosamine Arthritis Relief Oil from Doggo — combines CBD with glucosamine for joint support. A good dual-action option for older dogs.
Best for General Pet Wellness: CBD Oil for Pets from Honest Botanicals — unflavoured, suitable for dogs and cats. Available in 250 mg and 500 mg.
Safety: Can Dogs Overdose on CBD?
CBD has a wide safety margin in dogs. Research has used doses up to 20 mg/kg/day without observing serious adverse effects. The 2018 Cornell study found that even at 8 mg/kg twice daily — four times the standard dose — dogs showed no signs of toxicity.
That said, high doses of CBD can cause mild side effects:
- Drowsiness — the most common side effect, especially at higher doses
- Dry mouth — your dog may drink more water than usual
- Mild GI upset — loose stool or reduced appetite, typically temporary
- Elevated liver enzymes — observed at very high doses in some studies; typically reversible when the dose is reduced
Important safety notes:
- Avoid products with significant THC. Dogs are more sensitive to THC than humans, and even moderate amounts can cause disorientation, vomiting, and lethargy. Always use products specifically formulated for pets, or human-grade CBD oils with verified zero or trace THC levels.
- Check for xylitol. Some CBD products (especially edibles) may contain xylitol, an artificial sweetener that is toxic to dogs. Always read the ingredient list.
- Consult your veterinarian if your dog takes other medications, especially anti-seizure drugs or medications processed by the liver. CBD can interact with certain medications by affecting liver enzyme activity.
How Long Does It Take to Work?
For acute conditions (anxiety, restlessness), sublingual CBD oil typically takes effect within 30 to 45 minutes. CBD treats take 45 to 90 minutes.
For chronic conditions (arthritis, ongoing pain), most veterinary studies show meaningful improvement within one to two weeks of consistent twice-daily dosing. Some dogs show improvement within the first few days; others need the full two weeks. Don’t give up too quickly — and don’t increase the dose before giving the current level enough time to work.
Frequently Asked Questions
How much CBD oil should I give my dog?
The standard veterinary research dose is 2 mg per kilogram of body weight, given twice daily. For a 25 lb (11 kg) dog, that’s approximately 22 mg per day (11 mg twice daily). Start at 1 mg/kg and increase gradually based on your dog’s response.
Can I give my dog human CBD oil?
Yes, as long as the product contains no THC (or only trace amounts below 0.3%), no xylitol, and no artificial sweeteners or additives that could be harmful to dogs. Many people use the same Honest Botanicals CBD oils for themselves and their pets. Pet-specific products are formulated with flavours dogs enjoy and concentrations sized for smaller doses.
Will CBD make my dog sleepy?
At standard doses, most dogs remain alert and active with reduced pain or anxiety. Higher doses may cause drowsiness, which can be beneficial if you’re using CBD for sleep or nighttime restlessness. If your dog seems too sedated, reduce the dose.
How long can my dog take CBD?
The longest published veterinary study ran for 12 weeks with no adverse effects or diminishing returns. Many dog owners use CBD daily for months or years. There is no evidence that dogs develop a tolerance to CBD at standard doses.
Can I give CBD to my cat?
Yes. Cats also have an endocannabinoid system and can benefit from CBD. However, cats are generally more sensitive than dogs and require lower doses. Start with 1 mg per kilogram of body weight once daily. Our CBD Oil for Pets from Honest Botanicals is formulated for both dogs and cats.
This article is for informational purposes only and does not constitute veterinary medical advice. Consult your veterinarian before giving CBD to your dog, especially if your dog takes other medications or has a pre-existing health condition.
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