So finally after the vet visit... it seems Sam is doomed. The vet is 90% sure that it is Cryptosporidium parasite... parasite causes constipation and we've just been told to wait for a fecal sample to be sure of the parasite... just wondering if anyone has had any experience with this before though I hope not. The vet seems sure it's a death sentence. The parasite is also highly contagious and Sam must have been infected before we got them. Dean has shown no symptoms so far.. luckily....