Hi, thanks for the reply.
I've had a lab in the past with the said hip problem, but my kelpie/lab x has never showed a single sign of it, I expect this could be due to hybrid vigour. I am in some ways more a fan of mixing breeds a little than keeping to pure blood-lines, for this very reason, but I am prepared to be proved wrong being new to these things. I am clearly not a "proper" breeder or I wouldn't be posting this ad - but I am interested in carrying on my brilliant dog's bloodlines and I figure if I breed him with a full working bitch, either kelpie, collie or kelpie/collie, any pups will be 3/4 working genes and therefore I've a good chance that many of the litter will prove to be workers. I suppose this risk might make my dog unattractive as a stud dog, so I am favouring buying a bitch so I can do the breeding and risk-taking, but I thought this ad was worth a punt just in case there is a like-minded person out there! Hope that wasn't too waffly!