these are not my puppies, they belong to the lady i work for , they have had diarrhoea for going on 3 weeks, she has takent them to the vet he gave her some liquid medicine for the diarrhoea. it seemd to get better for a few days but has returned full force. now there is blood in the lose stools. a big kennell that she has bought dogs from told her it was a parasite cassucious or something like that, what is the cure for that and is it air born as she has other dogs in her kennel, also can humans contact this parasite as i clean up after the puppies. any help would be great thanks