Moving dogs from the U.K. to spain

We would always choose driving over flying, very few airlines will carry pets and only to and from specific airports. Driving gives you the choice of a long sea crossing with Brittany ferries or short crossing to France and a drive with stops. We always used Eurotunnel as the dogs stay with you in the car on the shuttle train. 

Many hotels in France and Spain allow pets, we used Booking.com to find as you can filter on pets alllowed. There are also websites that help you find routes.

Assuming you already have pet passports you will need to consider re-registering your chip with the Spanish database, a vet will do this, also make sure that the local innoculations are met, biggest difference is that Spain requires annual rabies vaccination. 

Post Brexit it may also be worth asking the vet to change your pet passport from UK to Spanish as this will avoid any issues when travelling in and out of Spain and the rest of the EU and the Spanish one will still be valid for any trips back to the UK. The Gov.UK website will have the latest on travelling with pets as this may change dependent on any EU / UK post Brexit deal. There are rules re specific breeds and the weight of the dogs that officially require dogs to be leashed and muzzled when outside, 25kg seems to be the cut off point and your breeds are not considered dangerous.

Depending on where you plan to live, there is lots of countryside to walk in and generally very few people and livestock to worry about.

Final point is re the temperatures in summer. Regularly mid 30s C even at 8 pm in the evening. Our dogs are walked before sunrise and then late in the evening and lie in the shade for the rest of the day, it is too hot for walks during the day.