I raise Bullmastiffs and they, being one of the larger breeds, are exceptionally hard to breed, successfully.

I have used 'Bitch Pills' for about 3 years and I know it produces larger litters. I bought one female from an experienced breeder and she had never gotten more than 5 pups from this bitch. I got her and put her on bitch pills and she presented me with 11 beautiful pups. This is well worth the money!! 5 stars for me