Currently it’s easy. Pooch needs passport, microchip, to be wormed and a rabies job at least 21 days before travel. However ours has never been checked coming into france! Going into England is another matter and you have to have everything and the worming signed by a vet giving date and EXACT time within a 5 day window.
If you have a category 1 or 2 dog then it is more stringent.
I personally think Eurotunnel is less stressful for pets than the ferries. And they have good facilities for dogs, with agility equipment, special area for bitches on heat and so on. Our country bumpkin was a bit intimidated tho’ when we went over one time at same time as Crufts and he was surrounded by the most superior creatures.
Well who knows what will happen in the next months…this is current gov advice post brexit.
But if you think the no-deal might happen at end Oct, then you need to start the process of rabies checking now! As need min of 3 months I think.