Hi there,
It is instinctive for dogs to eat grass, They maintain their digestion that way. However it can cause a blockage in the GI tract
You can get safe canine greens in a pet supply.
You can also add fiber bread and cooked veggies like carrots , green beans, broccoli to their meals. They can also have a daily vitamin and mineral suppliment.
http://www.holisticanimal.co.nz/downloads/diet_sheet.pdf
Add canned pumpkin (not pie filling) @ a tablespoon a day for fiber.
Please let me know if these suggestions solve the problem. I will always be here for you and your babies.
Sincerest best wishes,
Terri
Animal Healthcare expert
Expert in pet health and behavior. 20 year experience with animals.