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Importance of Sterilisation - Reasons To Sterilise Your Dog
 
Sterilised male dogs are less likely to develop behavioural problems such as aggression, urine marking and inappropriate mounting. Sterilisation is recommended after 6 months of age, ideally before behavioural problems develop. Sterilisation at a later stage may still help reduce these problems but it is best to address the best behaviour before it becomes a habit.

Once neutered, male dogs are less likely to develop prostate problems in later life, and are less likely to develop certain types of cancers. Neutering will not change your dog’s “personality” or make him less effective as a guard dog. Socialisation and obedience training are essential for a confident dog.

Sterilisation will not make your dog fat. Sterilised dogs do tend to need a little less to eat, but they will not get fat unless they are overfed or under-exercised. Your dog will not feel “frustrated” when he is sterilised. In fact, he will be less frustrated than an un-sterilised male that is confined without access to female dogs.

Local council registration is cheaper for a sterilised dog and you eliminate the risk of your dog being stolen for breeding purposes.  It is well known that breeding is a big responsibility and there is great time and effort on rearing healthy, well-behaved pups to good homes with responsible owners. Following the neutering procedure, most dogs are fully recovered and back to their normal behaviour within 24 hours of sterilisation.
 
It is also commonly know that if you neuter a female dog prior to puberty, she has an almost zero risk of developing mammarian cancer. Intact female dogs have seven times the risk of developing mammary tumours than do females sterilized early in life.
 
If you choose not to sterilize your companion dog (or choose to delay his or her sterilization until well after puberty), it is imperative that you ensure that he or she is contained in a safe, secure environment and is never given an opportunity to engage in unwanted breeding.