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Pet CBD Dosing Math: mg/kg ↔ mg/mL (THC‑Free Context)

This page shows how to turn a veterinarian’s target in mg/kg into practical amounts in mg, mL, and approximate drops using your product’s label and Certificate of Analysis (COA). It is educational only and not veterinary advice. Always follow your veterinarian’s guidance, use pet‑formulated products, and verify that the product is THC‑free (THC reported as Not Detected at the lab’s stated Limit of Quantitation, LOQ).

Why this page

Many pet guides say “ask your vet,” but owners still need a safe way to do the math once a vet provides a target amount. This step‑by‑step focuses on math only (not choosing a target). For reading pet COAs and safety checks, use the related resources linked below.

Quick definitions

  • mg/kg: milligrams of CBD per kilogram of the animal’s body weight (given by your veterinarian).
  • mg/mL: concentration of CBD in an oil (from label or COA). Example: 20 mg/mL means each 1 mL contains 20 mg CBD.
  • ND THC at LOQ: lab reports THC as Not Detected at its Limit of Quantitation. ND ≠ absolute zero; it means below the method’s reporting threshold.

Step‑by‑step: mg/kg → mg → mL (and approximate drops)

  1. Get the vet’s target: e.g., 0.5 mg/kg per dose.
  2. Weigh your pet (kg): 1 kg = 2.2 lb. Example: 22 lb ≈ 10 kg.
  3. Calculate mg per dose: mg/kg × body weight (kg). Example: 0.5 × 10 = 5 mg.
  4. Find product strength (mg/mL): from label or COA. Example: 20 mg/mL.
  5. Convert mg → mL: mL = mg ÷ (mg/mL). Example: 5 ÷ 20 = 0.25 mL.
  6. Estimate drops (optional): Many droppers deliver ~20 drops per 1 mL of thin oil. 0.25 mL ≈ 5 drops. Note: drop size varies; use the mL markings on your pet‑dropper if available.

Tip: If your bottle has a measured dropper (e.g., 0.25 mL tick marks), use that instead of counting drops.

If your label shows % instead of mg/mL

  • Oils listed as % w/v (grams in 100 mL) often approximate: 1% ≈ 10 mg/mL, 2% ≈ 20 mg/mL, etc. Check the COA for the precise mg/mL.
  • Gummies/chews list mg per piece; you may need to split or choose a lower‑strength item for small pets.
  • For accurate conversions, see COA Units & Conversions and prefer the COA’s mg/mL line for your batch.

Worked examples (illustrative only)

Example A — Dog, 10 kg, oil 20 mg/mL

  • Vet target: 0.5 mg/kg per dose
  • mg per dose: 0.5 × 10 = 5 mg
  • mL per dose: 5 ÷ 20 = 0.25 mL (≈ 5 drops if 20 drops/mL)

Example B — Cat, 4 kg, oil 10 mg/mL

  • Vet target: 0.3 mg/kg per dose
  • mg per dose: 0.3 × 4 = 1.2 mg
  • mL per dose: 1.2 ÷ 10 = 0.12 mL (use a marked, small‑volume pet dropper)

Example C — Chew, 5 mg per piece, 8 kg dog

  • Vet target: 0.25 mg/kg per dose
  • mg per dose: 0.25 × 8 = 2 mg
  • Chew fraction: 2 mg ÷ 5 mg per chew = 0.4 chew (cut to approximate; consider a lower‑strength chew for precision)

THC‑free specifics to verify before use

  • Batch‑matched COA: Confirm your lot number matches the COA.
  • THC lines: Δ9‑THC (and ideally THCA) reported as ND or <LOQ. See LOQ vs LOD.
  • Contaminant panels: pesticides, heavy metals, microbial, residual solvents appropriate for pet use.
  • Pet‑safe excipients: avoid xylitol and certain essential oils/flavors. See Ingredients to Avoid and Xylitol Safety.

Common red flags

  • No batch COA or COA doesn’t match your lot.
  • Label claims “zero THC” without clear LOQ on the COA.
  • Human product repackaged for pets with sweeteners like xylitol.
  • Conflicting units (e.g., % on label, mg/mL on COA) without explanation.

FAQ

What mg/kg should I use?
We do not provide dosing recommendations. Ask your veterinarian for a target and use the math above to convert it to your product.

How many drops are in 1 mL?
A common rule of thumb is ~20 drops per 1 mL for thin oils, but droppers vary. Prefer mL markings on a pet‑specific dropper.

Can I use a human THC‑free CBD product for my pet?
Prefer pet‑formulated products and verify excipients; human products may include ingredients unsafe for animals. See Ingredients to Avoid.

Is “THC‑free” guaranteed safe for pets?
“THC‑free” is a lab outcome (ND at LOQ), not a universal safety guarantee. Verify the COA and consult a veterinarian.

What if I suspect an exposure or my pet looks unwell?
Contact a veterinarian or an animal poison control service immediately. See Pets: Emergency Guide.

Related resources

Disclaimer: Educational only; not veterinary or legal advice. CBD products are not intended to diagnose, treat, cure, or prevent disease. Consult a licensed veterinarian about your pet’s situation.