i breed and have few pet dogs.i have 2 westies,shitzu,yorky,pug and a poodle.
i mated the yorky 4 weeks ago and she is proven but didnt get pregnant.i also mated a westie proven and shes not pregnant either.i have now mated a maiden pug to a proven pug.
i have been breeding for a number of years and never encountered anything like this.
i also mated another westie in april she failed to conceive aswell and then a poodle who i knew had issues with fertility  in june and she failed to cocnceive so thats 4 in a row that have failed.the last 2 dogs have since been spayed and rehomed.
i always use proven stud dogs and all bitches except the pug bitch are proven.
what am i doing wrong.

Can you explain what you mean by proven ?

My guess is that 'proven' means they've already had a litter,  going on the context of the post.

Q for the OP

Why are you mating all these bitches, what is the purpose of your breeding?       Either this is a wind-up or you have no use for your bitches unless they are producing - as you've already rehomed the last 2 who didn't produce for you.

To answer your question 'what am I doing wrong'  and for the education of any-one who might be reading this and doesn't already know,  IMHO   you are simply keeping your dogs to breed and when they don't produce, getting rid of them.    That is the MO of a puppy farmer or backyard breeder.

The rescues are full of unwanted dogs, bitches and puppies.    There is no possible reason to add to their number.

As I said, just MHO

Sounds like your bitches have a lot of common sense.

To expand on what some others have replied,. 

Breeding should not be an end in itself, but part of a larger picture that is primarily about being a custodian of the breed your involved in as an exhibitor, competitor or someone working their dogs.

There are too many unwanted dogs to be breeding purely to sell puppies, and this kind of breeding is considered unethical, as it doesn't help maintain breeds in good health and standards of conformation and temperament, just adds to the numbers, which there are too many of stemming from similar casual/profit motivated breeding where nothing is put back, no lifetime responsibility for puppies produced, or helping rescue situation.

Worse still it gives all breeders a bad name, by those involved in mopping up the fall out.

In answer to your original question, it is highly likely you have a build up of Canien Herpes virus within your breeding stock, preventing pregnancies establishing/being maintained. 

Me thinks this could be a wind up, as the postee has only joined today!!!

> what am i doing wrong.

Breeding from too many different breeds?

Rehoming dogs that are of no use to you for breeding?

Me thinks this could be a wind up, as the postee has only joined today!!!

Google the username. Comes up with various items listing occupation as dog breeder -and extremely houseproud.

This gives awhile new meaning to the phrase "missing in action." .LOL.

i normally breed westies and poodles.the yorky and the pug are my mums dogs.the 2 that were rehomed were spayed first and were coming up to 5 years old and as they missed we thought it unethical to breed them again due to their age and the fact that they already had had a litter each at 3 years old.im a liscensed breeder in the uk and all dogs are health tested etc and only have one or two litters and are first bred at 3 years old and no older than 5 years.we then spay and rehome or keep the bitches.

So you breed for money, a puppy farmer then

im a liscensed breeder in the uk

Which means you breed a LOT more than the rest of us here. None of us would ever need to be licensed as we'd never breed as many litters each year as 5.

> we then spay and rehome or keep the bitches.

Glad to hear you spay them first!
I noticed someone in your area is currently advertising an unspayed 4 year old Apricot miniature poodle bitch, as they are cutting down on their breeding dogs - this poor bitch will undoubtedly end up in the hands of a backyard breeder and go on to have many more litters, probably 'designer' crosses sold for silly money.

I am so glad that my spayed bitches never leave me.

yes they do get spayed as that could happen-go to back yard breeders.they r all spayed and vac when they rehomed-alot of my friends have them.i show westies and do agility with poodles and some are bred for resale as pet homes.

Not all licenced breeders are back yard breeders. However, as many have said, the majority of us on her only breed every now and then so don't need a licence. Therefore tend to look on someone with a few bitches with suspicion.

I don't know if will help, but to anyone whose bitches miss, I seem to remember someone, many years ago, who was having problems with their bitches catching. They ended up using rain water, instead of tap water, for their drinking water. The bitches then became pregnant. It was something to do with the recycled tap water having too much of the hormones from human birth control pills in the system, or so I believe ;-) Don't know if there was any truth to it, but sounds plausible to me.

I've heard the amount of hormones in the water affects fertility, but I'm not sure if it really does have any effect.

Perhaps there is some research on the Internet?

Husband used to work for Thames Water, and says that there would be hormones, from HRT patches etc,  in the first sewage effluent which goes through much more treatment before it reaches  the streams etc.      It is no longer measurable (but I suppose just might still be there in minute quantity) in the streams, which may  in turn be fed back and treated for drinking water.

Jo