The Defra website should help
http://www.defra.gov.uk/animalh/quarantine/ind ex.htm
I know to bring a dog into the UK it has to be microchipped....then have the rabies jab and blood tests, and more tests six months later. But I think if you are going abroad, and not bringing the dog back, you dont need to do anything, but I would check with defra, at least then you will have a definite answer.
Pet Travel Scheme Helpline: Telephone: +44 (0)870 241 1710 (Monday to Friday - 8.30am to 5pm UK time)