The following site has an option to search for 'dog-friend' holiday establishments in the selction criteria. Its seems to have more options available than most other sites I've come across. (Unless anyone else can help us please?)
You can request their brochure online too :) http://www.country-holidays.co.uk
We stayed at a lovely hotel in n.yorkshire, dog leads hung up if needed, ground floor rooms with own conservetry,dogs are made very welcome,you can even take them in the bar ,Stone House Hotel,Sedbusk,nr Hawes,wenslydale,N Yorkshire. Sheila.
Another fab hotel.Blakney hotel,Blakney point, norfolk,even take dogs on seal trips, lovely beaches near by, long drive for us but well worth it. Sheila.