CBD Oil for Dogs with Seizures

• McGrath 2019, JAVMA: 26 dogs with intractable epilepsy on existing drugs — Dose and design: 2.5 mg/kg twice daily (5 mg/kg/day); 12 weeks, placebo-controlled · Result: Median seizures down 33% vs 0% (P=0.01); 50%-responders 2 of 9 vs 2 of 7 (not significant); ALP rose in all CBD dogs · What it means: The "89% improved" headline is the press release, not the paper. Several times a label serving; add-on only
• Garcia 2022, Cornell: 14 refractory dogs on 3+ anti-seizure drugs — Dose and design: 2 mg/kg CBD/CBDA extract every 12 h (4 mg/kg/day); 24-week crossover · Result: Seizures per 12 weeks 8.0 to 5.0 (P=0.02); 50%-responders 6 of 14 vs 0; mild ALP rise; phenobarbital levels unchanged · What it means: Closest trial to a full-spectrum product; still 4 mg/kg/day, above label. Bring the phenobarbital finding to your vet
• Rozental 2023, JVIM (AKC CHF-funded): 51 drug-resistant dogs — Dose and design: 5 mg/kg/day failed futility after 12 dogs; then 9 mg/kg/day; 3-month crossover periods · Result: Seizure days down 24.1% vs up 5.8% on placebo (P=.002); 50%-responders 13 vs 8 (P=.07); appetite, vomiting, ALT changes (AKC CHF summary) · What it means: The lower dose failed; the dose that worked is far above any label. A supplement page cannot borrow this result
• Safety: Corsato Alvarenga 2024 (18 Beagles, 36 weeks); Bradley 2022 (20 dogs, 6 months) — Dose and design: 5 or 10 mg/kg/day; 4 mg/kg/day; placebo-controlled · Result: Well tolerated, no liver damage; ALP up at all doses, ALT at 10 mg/kg; monitor liver values on chronic CBD · What it means: Long-term safety exists at trial doses, with a liver-panel recommendation; for a dog on phenobarbital that is the vet's first question
• Honest Paws Calm CBD Oil label serving (comparison only) — Dose and design: One weight-matched dropper daily; 125 to 1000 mg bottles · Result: No efficacy claim; public COA per batch; under 0.3% THC · What it means: A fraction of the trial doses: a verified, loggable full-spectrum oil to discuss with your vet, not the trial result

One caveat: the oil manufacturer funded the first trial and the lead author held 5% ownership, and its press release claimed improvement in "89% of dogs"; the Rozental trial was funded by the AKC Canine Health Foundation. A head-to-head first-line trial of CBD versus phenobarbital is recruiting and has not reported, so CBD remains an add-on and anti-seizure drugs the gold standard. Owners should not buy CBD as a seizure treatment; if you still want to try it, buy the right product for the right reason and discuss it with your veterinarian.

In the Colorado State and Cornell studies, CBD was added to dogs already on 1 to 3 anti-seizure drugs, suggesting it is safe to combine the treatments, and the Cornell study found serum phenobarbital, zonisamide and bromide levels did not change. Three studies (Rozental, Corsato Alvarenga, Bradley) found liver enzymes rise (ALP at lower doses, ALT at higher), and phenobarbital uses the same liver machinery, so your vet may want to monitor liver values and blood levels or adjust timing. This is not fine print; it is the single most important practical fact on this page. Bring the batch COA, the product label and the seizure log to the appointment.

Full guide: CBD amount chart for dogs. Do not change, stop, or adjust prescribed medication when adding CBD; report the addition to your vet. The studied doses below are several times the label serving, given under close veterinary monitoring; do not try to reach them with a supplement at home. All three trials dosed twice a day, which you can mirror by splitting the daily serving in two with your vet's agreement. Escalating doses over time saw good results in a 2020 dose-escalation study. This supports a cautious start, and twelve weeks of twice-daily 2 mg/kg was generally safe in dogs and cats. After the first twelve weeks, re-evaluate and move ahead accordingly.

• 10 lb (4.5 kg) — Garcia 2022 dose, 4 mg/kg/day: 18 mg/day · Rozental 2023 effective dose, 9 mg/kg/day: 41 mg/day · HP Calm Oil strength: 125 mg (under 25 lb) · HP label serving: 4 mg CBD/day
• 25 lb (11.3 kg) — Garcia 2022 dose, 4 mg/kg/day: 45 mg/day · Rozental 2023 effective dose, 9 mg/kg/day: 102 mg/day · HP Calm Oil strength: 125 mg or 250 mg (band edge) · HP label serving: 4 to 8 mg CBD/day
• 50 lb (22.7 kg) — Garcia 2022 dose, 4 mg/kg/day: 91 mg/day · Rozental 2023 effective dose, 9 mg/kg/day: 204 mg/day · HP Calm Oil strength: 250 mg (25 to 50 lb) · HP label serving: 8 mg CBD/day
• 75 lb (34 kg) — Garcia 2022 dose, 4 mg/kg/day: 136 mg/day · Rozental 2023 effective dose, 9 mg/kg/day: 306 mg/day · HP Calm Oil strength: 500 mg (51 to 74 lb) or 1000 mg · HP label serving: 16.6 to 33.3 mg CBD/day
• 100 lb (45.4 kg) — Garcia 2022 dose, 4 mg/kg/day: 182 mg/day · Rozental 2023 effective dose, 9 mg/kg/day: 409 mg/day · HP Calm Oil strength: 1000 mg (75 lb and up) · HP label serving: 33.3 mg CBD/day

If you and your vet have decided to add CBD support, check the milligrams of CBD on the label and confirm them against the product's Certificate of Analysis; every Honest Paws batch publishes one. Seizure-prone dogs do best on steady routines, and the oil format is built for steadiness: a dropper delivers the same measured amount every time, absorbs faster than food formats, lets you adjust in small increments, and is easy to log. Every trial used a measured mg/kg oil dose twice daily, which is why this page sells oil and not treats; a chew cannot be halved to the milligram. Full-spectrum matters too: our extract keeps CBG and CBDA, the whole-plant profile used in the tolerability research above.

Afterward, expect post-ictal disorientation for minutes to hours; keep things quiet and log everything: time, duration, and what preceded it. That log, plus any supplement journal, is gold at the next vet visit. CBD cannot stop a seizure in progress, and you must never try to dose a seizing dog: CBD doesn't work magic, and giving oils or pills into the mouth during an active seizure is a choking and aspiration hazard.