Clary - If I am still in the US this summer and not in my own home in England- I would LOVE to home swap with you. I've been to Totnes and it's not too bland for me.
I live in a very nice, smallish though very comfortable house at the top of a hill overlooking a reservoir four miles outside of a pretty quaint little medium-sized town equidistant (about three hours) from NYC (south) and Boston (east).
It's a lovely area - probably the most uniformly beautiful place I've lived in all the places I've lived in the US- very green and lots of rolling hills - it actually reminds me alot of Somerset.
In terms of climate the summer would be very pleasant here - not too hot and not too rainy...the only downside I can think of is that for you, it might seem too isolated. It's definitely not downtown Totnes - you'd be surrounded by tracts of woods and lots of trees out here. I love it - but I know it's not for everyone.
Anyway - here's the view from my dining room:
I do have a dog, but I'd take her to a friend's house - I wouldn't expect you to keep track of her out here in all these woods. Anyway - let me know if the time frame works for you or the location interests you. I'll also let you know if I'll even still be here by then. I should know 100% by March.