Thanks everyone for your replies. I know this may sound funny but i'm not really bothered about the humping its more for the health reasons and in case some other dog owner doesn't take too kindly to bailey being attracted to their little princess he he

neutering is absolutely neccessary in some cases, especially when it comes to their health. dogs can get lumps and cancer in the testicular area as well as other health problems. you dont have to make the decision over night and you should weigh up the pro's and con's. but definately consider castration because your dog will definately benefit from it.