some sites really dont want you to take your dog and put high charges on for dogs, others will charge what they think they can get away with, last year my daughter went to martin mere (haven) it was an early season pitch offer 4 nights with ehu, water and hardstanding pitch and access to all facilities for £20 for the two of them and their van, Dogs £6 a night (they have 2 of them) rang to querry the price for the dogs and was told well kennels charge approximately £10 a night so we are cheaper than putting them in kennels if the owners want to bring them. The dogs came to stay with me(foc) whilst my daughter went away