Castrating your dog

Castration involves a general anaesthetic and removal of both testes and is best performed between 5-8 months of age depending on the breed.



  1. Tumours – a castrated dog will not get testicular tumours and it is also very rare for dogs that are neutered at a young age to develop tumours of the prostate gland or to suffer from benign prostatic hyperplasia since the male hormone, testosterone, is needed for these conditions to arise. Other types of skin tumour, also linked to testosterone, found commonly near the anus and prepuce will not arise either.
  2. Hernia – Testosterone causes a weakness in the muscles around the anal region which can lead to sudden hernia formation in that area. This is a serious condition since the bladder can become trapped and the dog is unable to pass urine. Surgery is required immediately.
  3. Discharge – having a prepucial discharge and lifting the leg to pass urine are hormonally driven, so castration will stop the discharge and greatly reduce the frequency of urination.
  4. Behaviour – if neutered early, a dog is less likely to become dominant or aggressive and also he will be much more attentive to yourself and your commands.
  5. Wandering – if neutered early, dogs are much less likely to wander off in search of in bitches in season


  1. We understand that your dog has to have a general anaesthetic for this procedure and that you may naturally concerned about this, after all, we hope it may be the only anaesthetic that he ever needs in his life. The operation itself is very routine and non-invasive. Our highly qualified and trained team of vets and nurses use the safest and most advanced intravenous and gaseous anaesthetics available and everything possible is done to minimise any risk (pre -operative blood tests and intravenous fluids if indicated). We have advanced anaesthetic monitoring machines and dedicated ward nurses to be with your pet throughout recovery.
  2. Non reversible – once castrated there is no further opportunity to breed. There is a hormone implant available now which is reversible if you feel that the operation is too permanent and you may like some further time to consider your options – please discuss this with your vet.
  3. Weight gain – a very hormonally active tissue has been removed and the food should be reduced by between 10-20%. Free advice is available all the time through our nurse clinics or phone us for advice on .
  4. Coat changes – some breeds, especially Spaniels, Retrievers and Setters will go on to develop a thicker, more fluffy coat after neutering.