Hi, can anyone give me advice, my 10 month old pup was nuetered 2 months ago, my girl which is my 10 months old mum is in season and i have just caught them at it in the garden, when i went out to stop them i found they had locked. I'm really worried now because i thought once i had my boy done he wouldn't be interested in girls. Im now thinking maybe the operation hasnt worked. My girl is all excited with herself, is there any possible chance she may be pregnant?.

Yes, there is a strong posibility.  The operation takes time to work.  Get her to the vet immediately for an injection and it should stop the conception.

I had my boy done last november was advised by my vet it can take 6-8 months for him to become infertile, my 8 month old pup is in season at the mo and hes still not allowed to be with her just incase.

As already said theres a very good chance your girl could end up pregnant, i would take her to the vets for the injection.

Thanks for your replys, when i took him to get done, i told the vet his mother was due in season in june, she's actually come into season 1 month early, the vet said he would be fine by the time she's comes in season. I will contact vet tomorrow just to be on the safe side. He is actually in his bed now looks like he's sulking and she's nowhere near him.