Benefits of Suprelorin (chemical sterilisation) in dogs

A reversible alternative to surgerySuprelorin is a hormone implant that temporarily suppresses fertility in male dogs. Unlike surgical castration, its effects wear off over time, allowing fertility to return in most dogs after the implant's action ends.

Avoids surgery and general anaesthesiaThe implant is inserted under the skin in a quick procedure that does not require surgery or general anaesthesia, making it an option for dogs that are poor anaesthetic candidates or whose owners prefer a non-surgical approach.

Useful as a 'trial castration'Veterinarians often use Suprelorin to help owners assess whether reducing testosterone improves behaviours such as roaming, mounting, urine marking or some forms of aggression before deciding on permanent surgical castration.

Temporary fertility controlThe implant provides a period of infertility, making it useful when owners want to delay breeding or prevent accidental mating without permanently sterilising a dog.

May provide health benefits associated with lower testosteroneBy suppressing testosterone production, Suprelorin may reduce the risk of testosterone-dependent conditions, such as benign enlargement of the prostate, while the implant remains effective. It can also reduce the size of the prostate and testicles during treatment.

No permanent loss of breeding potentialBecause the treatment is reversible, valuable breeding dogs can have temporary fertility suppression while retaining the possibility of future breeding once fertility returns.

Flexible treatment durationSuprelorin is available in formulations that typically last around six or 12 months, allowing veterinarians and owners to choose a duration that suits the dog's circumstances. Individual responses and duration can vary.

Important context

  • Suprelorin is approved for use in male dogs in many countries. Its regulatory approval and indications vary by country.
  • Dogs often experience a brief "flare" in testosterone levels shortly after implantation before hormone levels decline, meaning fertility is not immediately suppressed.
  • The implant does not produce permanent sterilisation, so repeat treatments are needed to maintain infertility.
  • Behavioural changes vary between individual dogs, and not all unwanted behaviours are driven by testosterone.