Magwart's correct. I worked a breed National Rescue for many years. Another issue can be financial. There's only so much money to be spent so the less they have to do, the more they can help. Whenever possible local fosters (who are part of the breed club or group so know the breed) to where the dog is located are used.
Magwart, LOL, we both gave the same group, I just did the regional area url. I prefer breed specific rescue when at all possible, they know the breed and any quirks better than anyone else.