Dog · Canis lupus familiaris · typical adult weight 2.00–80.00 kg
Finasteride is dosed at 0.1–0.5 mg/kg PO q24h in dogs, per Sirinarumitr K, Johnston SD, Kustritz MVR, Johnston GR, Sarkar DK, Memon MA. Effects of finasteride on size of the prostate gland and semen quality in dogs with benign prostatic hypertrophy. J Am Vet Med Assoc. 2001;218(8):1275-1280. doi:10.2460/javma.2001.218.1275; Lima CB, Angrimani DSR, Flores RB, Vannucchi CI. Endocrine, prostatic vascular, and proapoptotic changes in dogs with benign prostatic hyperplasia treated medically or surgically. Domest Anim Endocrin. 2021;75:106601. doi:10.1016/j.domaniend.2020.106601 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.552 (2026-08-01).. Finasteride is used in dogs for Benign prostatic hyperplasia. Routes documented in dogs: PO. A typical adult dog weighs 2.00–80.00 kg. ExoticRx lists 1 cited dose rule for Finasteride in dogs, drawn from published veterinary references. Verify against current literature before clinical use.
US trade names: Proscar, Propecia
| Route | Dose | Frequency | Duration | Indication | Evidence | Source |
|---|---|---|---|---|---|---|
| PO | 0.1–0.5 mg/kg | q24h | Months | Benign prostatic hyperplasia | Moderate | Sirinarumitr K, Johnston SD, Kustritz MVR, Johnston GR, Sarkar DK, Memon MA. Effects of finasteride on size of the prostate gland and semen quality in dogs with benign prostatic hypertrophy. J Am Vet Med Assoc. 2001;218(8):1275-1280. doi:10.2460/javma.2001.218.1275; Lima CB, Angrimani DSR, Flores RB, Vannucchi CI. Endocrine, prostatic vascular, and proapoptotic changes in dogs with benign prostatic hyperplasia treated medically or surgically. Domest Anim Endocrin. 2021;75:106601. doi:10.1016/j.domaniend.2020.106601 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.552 (2026-08-01). |
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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.
Inhibits 5-alpha reductase type II, blocking conversion of testosterone to dihydrotestosterone (DHT). Reduces prostate size.
Used for benign prostatic hyperplasia in dogs. Teratogenic — do not handle crushed tablets during pregnancy. Effects take weeks. Does not affect libido.
Species-specific contraindications and adverse-reaction reports for dogs may differ from canine / feline reference data — consult the primary citations listed with each rule.
Finasteride dose range in dogs, with cited source references: PO 0.1–0.5 mg/kg q24h. Reference ranges from cited sources — verify against current literature before clinical use.
Documented routes for Finasteride in dogs: PO.
Cited course lengths for Finasteride in dogs include: Months. Duration depends on the indication — match it to the specific dose rule in the table above.
Finasteride is indicated in dogs for: Benign prostatic hyperplasia.
These are general warnings for Finasteride across species; consult the dog dosing table above for species-specific guidance. Used for benign prostatic hyperplasia in dogs. Teratogenic — do not handle crushed tablets during pregnancy. Effects take weeks. Does not affect libido.
Why a species-specific page? Finasteride 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.