Just wondering if anyone has experienced their bitches going from having 11 and 13 puppies, (1st Litters) to 5 and 7, then 3 and 0. 2 Cane Corsos bitches, same stud. And GSD,s, 1 bitch having 8, then 1, then 0.Same GSD stud, other bitch 0. Have changed food 3 times, even did my own raw diet on 1 bitch. Have had the 2 studs checked, Fast, Excellent semen. Had bitches blood sent off for a extensive test, nothing! Live in the country and my dog runs were exposed to runoff during heavy rains so I built a Dike around my runs to prevent any sprays from reaching my dogs. Last Cane Corso litter I had 3. Good healthy puppies. Last litters 1 dead and a big 0 before. Any ideas anyone. I have exhausted everything. I considered myself a good breeder until now. guess the only thing I havent tested is the ground. But its the same as before. The dogs have a clean 5by5 kennel, a 200 by 30 ft run with 24 hr access, doggie beds, Each 1

Do you progesterone test before mating?

Herpes?

As you're in the US (going by your country flag??) Besides herpes, I'd be thinking of brucellosis and running a blood test on the dogs concerned to test for it.  (Which should be done before breeding in countries with brucellosis anyway...).