Pet Passports after Brexit

Hi. i wonder if anyone can clarify the potential rule changes for Pet Passports and travelling in Europe, before and after Brexit.

Moderator Edit:

There is a 'sticky' thread in the Overseas Sites and Touring Section entitled "Travelling after Brexit"which contains a link to information, topics include Pet Passports before and after Brexit.  You might find this useful so I'll close this thread to avoid duplication.