
Hi Jacq,
>We love our Staffordshire Bull Terrier so much and can't bear the thought of losing him one day<
We all feel like that about our dogs - if only they could go on forever :( If he's your absolute dream boy the best thing you could do is go back to the same breeder you first got him from and ask if you can have a puppy closely related to him or if they know of anyone else they could recommend using the same lines at the time you're looking for a new addition.
>We don't think he'll appreciate a puppy nipping around him<
No offence intended, but if you're unsure of how he'd be with a puppy while he's around then perhaps his temperament is not best suited to being bred on from :( If it's because he is now elderly and/or infirm then he's unlikely to be fertile anyway.
Whatever his age or health status now, love him and enjoy him for what he is - when you lose him he will be irreplaceable anyway but as suggested already, his relatives may be around and you can hopefully have a little bit of him that way. Best wishes, Teri :)