The BSAVA strongly recommends that the neutering of companion animals should be considered for reasons of population control and the prevention of unwanted litters.

The decision as to whether to neuter the individual animal for medical or behavioural reasons needs to take into account factors such as species, gender, breed and age of the animal as well as current and future health status. Veterinary advice should always be sought regarding the risks and benefits in individual cases.

There are now a number of options regarding the timing and methods of neutering and these options should be discussed between the owner and veterinary surgeon when making decisions for an individual animal.


Background information


The BSAVA strongly supports the practice of neutering cats (castration of tom cats and spaying of queens) for the over-riding reason of preventing unwanted kittens, thus removing the problems associated with finding homes or increasing the stray population.

Additional benefits of neutering cats include:

  • Reduction of roaming, and thus reduction in numbers of cats injured or killed in road traffic accidents.
  • Reduction in fighting, and thus reduction in infected wounds and abscesses and spread of infection.
  • Elimination of the risks of pregnancy, and its complications as well as ovarian and uterine diseases.
  • Significant reduction in the risk of mammary tumours.
  • Neutering of cats is also likely to reduce the risk of urine spraying.

The BSAVA is a member of the Cat Group and supports the Policy of the Cat Group on pre-pubertal neutering (i.e at 4 months of age rather than at the traditional 6 months of age).


The BSAVA recommends that neutering of dogs should be considered in the following circumstances:

  • For population control and to prevent the perpetuation of genetic defects.
  • To reduce sexually motivated behaviours in male dogs, such as straying response to bitches in season.
  • To prevent potential problems associated with the oestrus cycle (oestrus, season, or heat) and false pregnancy.
  • For medical reasons, e.g. to prevent or remove testicular tumours, or reduce perianal adenoma or prostatic hyperplasia.
  • To prevent or remove pyometra and other uterine diseases.

Before neutering for reasons of undesirable behaviour it is important to consult a veterinary surgeon to ascertain the role of sexual hormones in the development and maintenance of the behaviour.


The BSAVA recommends that all non-breeding rabbits should be neutered (ovario-hysterectomy and castration respectively) soon after they attain sexual maturity. The exact age varies with respect to breed, ranging from 4-6 months and up to 9 months in giant breeds.

Benefits of neutering include:

  • The prevention of pregnancy and unwanted litters.
  • The reduction of undesirable sexual mounting behaviour and hormonally related aggression.
  • The prevention of pseudo-pregnancy.
  • For medical reasons such as the prevention and treatment of uterine neoplasia and other uterine diseases.


The BSAVA recommends that as a general principal alternatives to surgical neutering should be recommended in ferrets, but that options and potential risks and benefits should be explained and discussed with owners to choose the best solution for the individual ferret and the owners particular situation and requirements.



The Cat Group


BSAVA Council as Policy Statement No. 25 (Castration of dogs) 1999 updated 2006

BSAVA Council as Policy Statement No. 29 (Neutering of cats) 1999. Updated 2006

Neutering of rabbits Approved by BSAVA council 2007.

BSAVA Council as Policy Statement No. 24 (Spaying of bitches) 1999 updated 2006

Latest Update 2013

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