Just out of interest what are the signs and symptoms of parvo and how do dogs catch it?? Can those vaccinated against it still get it??

Some information about it here.

Can those vaccinated against it still get it??

Yes, vaccinated dogs can still be affected by parvovirus. :(

what is mucousy poo a sign of in pups my little boy pup has just had a quite mucousy poo but he is eating and drinking ok and playing happily with the others

My bitch had mucusy poo when she was about 9 months, it was bloody too! Panicked took her to the vet and tried everything! He gave her antibiotics and a week later he took a blood sample to see if she had an allergy to anything. She was fine in herself, eating and drinking as normal and playing with her friends. About a week after the blood test she went to the toilet by the back door. It had a tape worm in it, I only knew what it was because I had seen a couple before in horse manure. I keep a strict worming routine with both my horses and my dogs so I did not understand how she had picked one up. The vet did not seem to concerned but did suggest that I vary the wormer I use with both horse and dog.

my pups are 4 weeks old there was no blood in his poo and they have been wormed at 3 weeks and are due again at 5 weeks mum is also wormed regularly so shall just keep an eye on him and hope he is ok.......

Would help if she did not have such an appitite for horse poo! I spend a lot of my time telling her off for eating it - yuk! The fresher the better too! I have to be damn quick with the poop scoop!