United Kingdom


Species: Dogs, Ferret

Ranges: Reproduction

Suprelorin picture

An innovative hormone implant, licensed for use in entire male dogs and ferrets, to provide temporary castration.

Suprelorin is an easy-to-use subcutaneous implant which is a peptide-based contraceptive implant containing the GnRH-agonist deslorelin.  This means that its slow release of hormone causes an interruption of the hypothalamic-pituitary axis, supressing both LH and FSH production.  In entire male dogs, this causes a suppression in testosterone production from the testes and gives a reduction in libido, temporary infertility, absence of spermatogenesis and reduction in testicular size.  The implant comes in two strengths and lasts for at least 6 months (4.7mg implant) or 12 months (9.4mg implant) in dogs and at least 16 months but up to 4 years (9.4mg implant) in ferrets.



Suprelorin provides a safe and reversible way to castrate dogs for a range of reasons:

  • owners who want to try castration and make sure they are happy with the effect;
  • owners who want the health and lifestyle benefits of castration without a permanent surgical procedure;
  • breeders who want to have multiple entire dogs in their household but select which they use as a sire;
  • dogs who are in training and owners want the effect of castration but might want to breed from them at a later date;
  • many others.


Additional tools and information include:

1. VIDEO: ‘An alternative to surgical castration provides a choice to pet owners’

A new video produced in conjunction with the British Veterinary Association (BVA) and ITN, as part of the ground-breaking ‘Veterinary View’ series, seeks to show that medical castration can offer an appropriate solution in many types of cases and can bring additional benefits to both the patient and to the practice.

1. An alternative to surgical castration provides a choice to pet owners



Full information on BVA videos


2. Study looking at attitudes to castration in vets

The above video follows publication of a study* in 2016 which surveyed 411 vets looking at attitudes to castration. It showed 76% of those questioned recommended neutering as a routine procedure for all male dogs, whilst only 52% said they offered clients alternatives to surgical neutering. The study was carried out by Dr Vicki Adams MRCVS, a veterinary epidemiology consultant, and was supported by Virbac. Commenting, she said: “The survey showed that, while most vets recommended permanent neutering as a routine procedure, more than 90% also agreed that medical castration was an option when an owner wants to assess whether castration will improve a male dog’s behaviour.”

Full information on the study

*Attitudes to and opinions of neutering in dogs: Results of a Canine Reproduction Survey of Veterinary Surgeons, Vicki J Adams BSc (Agr) DVM MSc PhD MRCVS.



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