
To be honest, if you need to ask on here for a suitable stud dog, then you do not have enough knowledge about your breed to thinking of mating your bitch responsibly. Firstly, is your bitch a Lakeland Terrier or a Fox Terrier? As far as I am aware, there is no such breed as a Lakeland Fox Terrier - unless this is a deliberate working cross?
Do as Jackie suggests. Spend the next 6 months researching the breed & suitable lines \& also to decide if your bitch is actually good enough to be worth breeding from.