Has anyone heard of something called Matel (I think that is how it is spelled) Itok a bitch to be mated who is difficult to 'catch' and the stud dog owner used this method and by golly it worked! she is heavily in whelp due on the 18th. Seems like a valuable tool if one has no stud dog  and also if one has to travel a long distance for a mating.

There are quite a few threads on the Mate Tel, if you type it in the search engine there's plenty to read.