A male puppy has started trying to mount bitches. What should the owner do?

Q: I have a nine-month-old male springer spaniel puppy that has recently started trying to mount bitches even though they are not in season. I have been 
told it might be best to have him castrated. What would you advise?

A: Before deciding on puppy castration, it is important to understand what the procedure achieves and how likely it is that castration will modify or eliminate the undesirable behaviour.

Castration involves removal 
of the testes, the main source of 
testosterone in males. Testosterone 
does not directly cause behaviours 
but it does increase the likelihood 
that certain behaviours will occur, such as the excessive mounting of other dogs. Whether or not castration will stop this behaviour will depend on a number of things.

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Is it really testosterone related?

Obviously, it will depend on whether or not the behaviour is influenced by testosterone. Many such problems are not influenced by testosterone at all. Mounting can occur for other reasons, including frustration and anxiety, and can constitute a part of normal male adolescence.

It will also depend on how long your dog has been showing the problem behaviour. Learning increases the likelihood of a dog continuing to 
show a particular behaviour after 
castration. To help overcome the 
problem of learned behaviour, you should introduce reward-based training and appropriate mental and physical stimulation. Distract the dog and make sure you reward the alternate behaviour and avoid rewarding your dog for mounting 
by giving him attention.

spaniel puppies

Should you neuter your dog?

Neutering dogs 
has become such routine practice that I’m sure many people don’t give it a second thought. Bitches always…

A reversible indicator of castration

You might also talk to your vet 
about using the drug deslorelin acetate. Deslorelin is one of the best reversible indicators of the effect of castration, so it can be used to assess the potential behavioural effects of surgical castration. Testosterone levels will initially increase after implantation under the skin but they then start to fall and reach typical post-castration levels in about four to six weeks.
If this reduces your dog’s tendency to mount other dogs you can be more confident that castration will be effective.