Just returned from 3 nights at longleat, the site itself is very clean and the staff very friendly. the  dog walk is sufficient and the kids play area is great, very clean and modern. longleat is literally a short walk around the corner, my advice is buy a two day pass if you have kids as there's plenty to do. We also visited Bath and got a two for one entry at the roman baths on producing our CC card. A saving of £14!. We would recommend this site and may return once our kids get older.....oh and you CAN hear both the lions and the sea lions in the evenings which completely baffled our springer spaniel!