Dog · Canis lupus familiaris · typical adult weight 2.00–80.00 kg
Fenbendazole is dosed at 50 mg/kg PO q24h in dogs, per SAFE-GUARD - Fenbendazole Granule [US Product Label for Dogs]. Merck Animal Health; 2021. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=0b88111d-db04-46c4-99c3-da1b748c1d60 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.533 (2026-08-01). — Plumb's 10th ed (held) printed p.506, Fenbendazole monograph spanning p.505-507; page located 2026-08-05 from the book's own running heads, and carries this exact dose under the matching species heading. — SOURCE EDITION: Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207. Fenbendazole is used in dogs for Hookworms (Ancylostoma caninum), Giardia, Whipworms (Trichuris vulpis), Roundworms, hookworms, whipworms, Giardia. Routes documented in dogs: PO. A typical adult dog weighs 2.00–80.00 kg. ExoticRx lists 4 cited dose rules for Fenbendazole in dogs, drawn from published veterinary references. Verify against current literature before clinical use.
US trade names: Panacur
| Route | Dose | Frequency | Duration | Indication | Evidence | Source |
|---|---|---|---|---|---|---|
| PO | 50 mg/kg | q24h | 3 consecutive days | Hookworms (Ancylostoma caninum) | Strong | SAFE-GUARD - Fenbendazole Granule [US Product Label for Dogs]. Merck Animal Health; 2021. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=0b88111d-db04-46c4-99c3-da1b748c1d60 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.533 (2026-08-01). — Plumb's 10th ed (held) printed p.506, Fenbendazole monograph spanning p.505-507; page located 2026-08-05 from the book's own running heads, and carries this exact dose under the matching species heading. — SOURCE EDITION: Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207 |
| PO | 50 mg/kg | q24h | 5 consecutive days | Giardia | Strong | PANACUR - Small Animal 10% Oral Suspension [UK Product Label for Dogs and Cats]. MSD Animal Health; 2021. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=859d4e30-d70c-4baf-aa62-0d3feff25057 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.533 (2026-08-01). — Plumb's 10th ed (held) printed p.506, Fenbendazole monograph spanning p.505-507; page located 2026-08-05 from the book's own running heads, and carries this exact dose under the matching species heading. — SOURCE EDITION: Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207 |
| PO | 50 mg/kg | q24h for 3 consecutive days | 3 consecutive days; repeat in 3 weeks and 3 months | Whipworms (Trichuris vulpis) | Strong | SAFE-GUARD - Fenbendazole Granule [US Product Label for Dogs]. Merck Animal Health; 2021. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=0b88111d-db04-46c4-99c3-da1b748c1d60 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.533 (2026-08-01). — Plumb's 10th ed (held) printed p.506, Fenbendazole monograph spanning p.505-507; page located 2026-08-05 from the book's own running heads, and carries this exact dose under the matching species heading. — SOURCE EDITION: Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207 |
| PO | 50 mg/kg | q24h | 3-5 consecutive days; repeat in 2-3 weeks for whipworms | Roundworms, hookworms, whipworms, Giardia | Strong | SAFE-GUARD - Fenbendazole Granule [US Product Label for Dogs]. Merck Animal Health; 2021. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=0b88111d-db04-46c4-99c3-da1b748c1d60 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.533 (2026-08-01). — Plumb's 10th ed (held) printed p.506, Fenbendazole monograph spanning p.505-507; page located 2026-08-05 from the book's own running heads, and carries this exact dose under the matching species heading. — SOURCE EDITION: Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207 |
Every held source for this drug and species, as printed. Where they differ, both are shown — the choice is yours, not ours.
The sources disagree for this combination. The ranges below do not overlap on a comparable route. This is not an error in one of them — published veterinary references differ, and reconciling them for a particular patient is a clinical judgement.
| Dose (mg/kg) | Route | Source | As printed |
|---|---|---|---|
| 50 | PO | BSAVA Small Animal Formulary, 10th ed — Part A (Canine and Feline)p.176 | • Roundworms, tapeworms: dogs <6 months old: 50 mg/kg p.o. q24h for 3 consecutive days; >6 months old: 100 mg/kg as a single dose p. |
| 100 | PO | BSAVA Small Animal Formulary, 10th ed — Part A (Canine and Feline)p.176 | : 50 mg/kg p.o. q24h for 3 consecutive days; >6 months old: 100 mg/kg as a single dose p.o. Treatment of Capillaria may need to be extended to 10 da |
| 20 | PO | BSAVA Small Animal Formulary, 10th ed — Part A (Canine and Feline)p.176 | 20 mg/kg p.o. q24h for 3 days. |
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These ranges are per kg. Enter your dog's weight to get the precise dose and draw-up volume — unit and concentration math done for you.
Binds to beta-tubulin, inhibiting microtubule polymerization in parasites. Disrupts energy metabolism and cell division.
Very wide safety margin. Rarely causes vomiting or diarrhea. Safe in pregnant animals at standard doses. Must be given for multiple consecutive days for efficacy.
Species-specific contraindications and adverse-reaction reports for dogs may differ from canine / feline reference data — consult the primary citations listed with each rule.
Fenbendazole dose ranges in dogs, with cited source references: PO 50 mg/kg q24h; PO 50 mg/kg q24h; PO 50 mg/kg q24h for 3 consecutive days; PO 50 mg/kg q24h. Reference ranges from cited sources — verify against current literature before clinical use.
Documented routes for Fenbendazole in dogs: PO.
Cited course lengths for Fenbendazole in dogs include: 3 consecutive days; 5 consecutive days; 3 consecutive days; repeat in 3 weeks and 3 months; 3-5 consecutive days; repeat in 2-3 weeks for whipworms. Duration depends on the indication — match it to the specific dose rule in the table above.
Fenbendazole is indicated in dogs for: Hookworms (Ancylostoma caninum), Giardia, Whipworms (Trichuris vulpis), Roundworms, hookworms, whipworms, Giardia.
These are general warnings for Fenbendazole across species; consult the dog dosing table above for species-specific guidance. Very wide safety margin. Rarely causes vomiting or diarrhea. Safe in pregnant animals at standard doses. Must be given for multiple consecutive days for efficacy.
Why a species-specific page? Fenbendazole pharmacokinetics differ across species: dose ranges, intervals, and route preferences are not interchangeable. Cross-extrapolation from canine doses is unsafe in dogs — the rules above are the citations specific to this species, not generic recommendations.
Sourced from published veterinary references; awaiting credentialed clinical reviewer. See our editorial process. Reference only — not veterinary advice.
| 50 | PO | Papich Saunders Handbook of Veterinary Drugs, 4th edp.344 | • 50 mg/kg/day for 3 days PO. Duration may be extended to 5 days for severe |
Figures are transcribed from the cited page or table of each held edition and are shown for reference only. They are not dose recommendations, they do not feed the calculator, and none has been reviewed by a veterinarian.