Thanks guys. I got to see my favourite vet today, a little Spanish lady who loves Dylan. She always explains everything and her partner is nice too, they always go into the science of the problem and I do like to know
why we are following a certain course, you have probably noticed
The reason a three day sample was needed was because parasites can show on alternate days, any sample is good but if you can wait, 3 days is more likely to show up something.
She said the blood is from his intestines (or somewhere else inside, I can't be sure I remembered everything) so he really is sore and we have to take measures to be gentle with his food and the pills will help him.