my parents had something similar with their pup.she had blood in her poo not sure how much as i didnt see it,she went to the vet he wormed 1st n kept her in for 2 nights on a drip then said it could be parvo as it can be passed from the mum.she came home & there was still blood so back she went but it was a different vet & he didnt seem as concerned as she had picked up n gave them some special food she is ok now.i do not know if it is the same as your dog of course but just wanted 2 let u know it was similar & she pulled thru.hope that helps a little all the best thinking of you xx(ps she did contact the breeder 2 warn him just in case but that is what they did i must stress)

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]mummy 2 :_lucy x rescue,2 golfish & 3 gals, african grey parrot - mojo x