Don't know anything about the Welsh, but I never met a Brittany I didn't like.
How do you know it is a pulled tendon?
She's eating now?
^^ They breed showline/companion dogs. In general, the dog are okay, but I believe (you will have to confirm this) the program is less than it was in the '70s and '80s.
Why buy there? Romance? Like any breed, the search for a good GSD will require a lot of research, verification of health certs, travel, and some luck.
What do you want out of this dog?