Thanks guys for all your replies.
I will be getting him done around 6 mths which is what the vet has suggested without the males support(they don't want to see his face as i'm walking him into the vet).
Funnerly enough i asked for your help to show them there would be nothing to worry about but they don't want to read your comments.
Not to worry, Buster is the product of a back yard breeder that we rescued, he was very under nourished when we got him and quite small for his age. He is doing so much better now, has put on 4 kilos in 3 weeks, isn't as withdrawn and is just a pleasure. i won't be making the same mistake as the previous owner.
We haven't had a dog for 5 years after we had our 17 year old Cattle x bullterrior put down , she was another rescue, and have forgotten how much pleasure these little sweet heart bring into your life.
thankyou.