Dogs need vet check / ties are no longer producing pups
I think you likely need to talk with a veterinarian as there likely is something more than a change of dog food involved.
Use this Web link to go to a list of dog medical issues and then choose Canine Infectious Infertility and Canine Noninfectious Infertility:
The articles give you an idea of the many different causes of your dogs' infertility.
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our bassets are no longer producing pregnancies... both the studs and ******* have parented litters until the last 8 months.... only one thing has changed.... the dog food.... by the ingredients it seems to be complete but I am beginning to think there MUST be something missing or too low, but we don't know what... any ideas?