Hi we have a 19month old bull dog, we are thinking about studding him.  What is the correct age and where would be the most appropriate place to gather my information on this subject.

Firstly, have a read of the first post on the Breeding forum of this site (entitled "Should I offer my pet dog at stud?"). Then if you still think the idea's possible, contact the breed clubs and ask for advice from the specialists.
:)