The Shiba Inu is a very cat-like dog, grooms its own fur, etc. If she is willing, a greyhound or whippet does sound like a far better choice for her than a Weimaraner. Greys are know to be 90-mile-an-hour couch potatoes. Love to run full out when they can (so a fenced park excursion would be good, but otherwise are happy on the couch!