You don't have to specify a breed on petfinder though. *You can enter
Young, Female, Medium sized and you will probably get several dogs
matching your criteria of various breeds.

Thanks for the pointer. I've already been doing that using "medium"
and "large". Sizes on petfinder seem to vary by whatever the listing
shelter's own criteria are, rather than by any set standard. We've
seen some likely candidates, I guess now we need to get serious about
meeting some of them.

--Glenn Lyford