I can highly recommend staying at Una St Ives in West Cornwall. As a family of four, we took our 18 month old Miniature Schnauzer Roxy & we stayed here in August for a week. The site is made up of 28 2/3/4 bedroom houses, some of which had hot tubs. The site also offers free use of the Spa, Swimming Pool, Sauna, Steam Room & Gym. The on-site restaurant, Una Kitchen, was also extremely dog friendly & the food was of a very high standard.
The location was perfect for exploring West Cornwall. We visited St Michael’s Mount, The Minack Theatre, Lands End & Mexico Towans beach in Hayle, all of which were dog friendly.