if it parvo give them peppo bismo and pedilite that he's doing keep them home in a warm spot give them liquads from a needle syringe when they get a lille better try some of here dog food (hard) in a blender with a little water and give that to them by syringe my bassets had parvo and i doctored them until they made it ...also hubby had ssome i think it was called la200 it was for sheep goats ect...we just took a chance because they were so weak there were times you didn't know if they were breathing....Maybe thats what helped...if you do it then maybe ask a vet because mine was basset pups so they were bigger then yorkie pups