Dog friendly Ferries to Spain

We travelled Portsmouth Santander 21st Oct on the BF Galacia, it was a 2 night crossing, fido was in kennels onboard, not an ideal situation but we took this crossing at last minute dot com as finding diesel in France was difficult, we will be returning in January Santander - Portsmouth with a dog friendly cabin booked well in advance, we choose the Santander crossing during the winter months as the weather in France can be worse than the UK so no fun, but during the summer months we normally do Portsmouth - Caen, 5 hour crossing, and then a pleasant drive thru France & Spain, fido is perfectly ok in the boot or dog friendly cabin if available.

Temperatures currently in the region of 22-25 degs (Mazarron), last year when travelling home late June it was 43 degs in the Madrid area not pleasant for dogs or humans in a caravan, and would certainly not do July/August unless you have very good a/c in your unit and you are all used to high temps 40 deg +, even the locals hide.

p.s. it is possible to sit on the upper deck with your dog, no need to use the kennel, but of course if the weather turns rough the upper deck could be out of bounds which would mean your dog would have to be locked in its kennel, we take a small fold up chair, our fido is ok to be left in cabin alone, he is fairly old so he just sleeps, you can buy calming pills for dogs which some say work very well, but never used them, guess only like sleeping/sea sickness pills for humans.