1. micro chip fitted
2. normal puppy vacinations (8 & 10 weeks) or booster if a adult dog.
3. rabies vacination given
4. one month later blood test taken by approved lab to test for rabies antibody assuming a pass (if not repeat stages 3 & 4) wait 6 months then your dog can travel in and out of the uk.
he or she will need to be treated for fleas,ticks and worms 24-48 hours before re-entering the uk every timne he/she goes abroad. :)
if you look on the DEFRA website there are details on there.