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Stanozolol for Dogs: Treating Anemia, Boosting Weight & Muscle

Published on September 10, 2024
Updated on November 5, 2025
Reviewed by Petco's Veterinarian Team
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Stanozolol is a hormone that is derived from testosterone. It can be used in dogs to help build muscle, create weight gain and create red blood cells.

Summary

Used For:

Anemia, weight gain, muscle building

Brands:

Winstrol-V, Winstrol

Species:

Dogs, use in cats is not recommended

Other names:

Drug type:

Endocrine

Prescription required:

Yes

Pregnancy and lactation:

Not safe for use in pregnant or lactating animals.

Side effects:

Depression, vomiting, or jaundice

No longer marketed in the United States:

General description

Stanozolol is an anabolic steroid that is used in veterinary medicine to increase appetite, cause weight gain and treat certain types of anemia. It is a hormone and has similar effects to testosterone. It is mainly used in dogs; it can be dangerous when used in cats.

Uses

Stanozolol is labeled for use to help animals gain weight, build muscle and combat anemia.

How it works

Stanozolol is derived from testosterone and has the same effects as this hormone on the body. It works by increasing anabolic metabolism.

Dosage

Dogs: 1 - 2 milligrams per kilogram given orally every 12 hours.

Forms

2 milligram tablets available, 50 milligram per milliliter injectable formulation also available.

Storage information & handling

Tablets: Keep dry and out of direct sunlight.

Injectable: Keep at room temperature and out of direct sunlight.

What results can I expect?

Several doses of stanozolol may need to be given before results can be seen. Depending on the condition being treated, weight gain and increase in muscle mass may be seen after 1-2 weeks. Increased red blood cells counts may be seen within a week.

Missed Dosage

If a dose is missed, the next dose should be given at the next scheduled time.

Overdose / acute toxicity

Side effects are more severe if overdose occurs.

Side effects

May include:

  • Liver toxicity
  • Masculine effects

Contraindications

Do not use in:

  • Pregnant animals
  • Breeding stallions
  • Food animals
  • Animals with liver disease
  • Animals with kidney disease
  • Pregnant animals
  • Cats
  • Animals with hypercalcemia, myocardial infarction, pituitary insufficiencty, prostate carcinoma, mammary carcinoma, benign prostatic hypertrophy

Drug interactions

Stanozolol does not have any known drug interactions.

Precaution

Do not use in pregnant animals.

Sources

Saunders Handbook of Veterinary Drugs

Disclaimer
The information contained on this page is for educational purposes only. This medication should only be given under the advice of a veterinarian who has examined your pet under the laws applicable to your state of residence.

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