Umm, i got to Santander last from Plymouth with my dog. Special dispensation coming back from St Malo to Portsmouth. (:I
A dog with a bike wont get on as a foot passenger, I know the security are a bit dense but unless that dog can at least walk on 2 legs and possibly wear a large floppy hat I don't think you will get it on.
Typical, Last night I booked a 6 day crossing (Dover/Calais) for later this month and didn't see this offer until just now. I wonder if it is retrospective. Ah well.
Your dog has a bike? He certainly has no feet
A cycling dog on a ferry? Don't see that very often..