The United Kingdom has severe penalties for drug smuggling. Drug traffickers may try to trick travellers. If you are travelling to the United Kingdom, avoid any involvement with drugs. Never carry luggage or parcels through customs for someone else. No - you cannot bring your pets on holiday with you.
Animals can carry diseases like rabies and the UK is currently rabies free.
Any pet animals that do enter the UK must have a current import license and undertake 6 months quarantine at approved quarantine premises. There are no exceptions and any illegally imported animal is liable to be destroyed. The law is, however, currently under revision. Subject to a successful pilot scheme, from April 2001 dogs, cats and some other species coming from the EU and certain other countries and rabies free islands will be allowed to enter the UK without quarantine, provided they meet certain conditions. Other animals currently affected by the rabies law will still be subject to six months quarantine.