This is probably a stupid question, but I couldn't find the answer online. Are there particular breeds of dogs that are born with dew claws on their rear legs? I'm asking because my friend's foster dog (GSD) has dew claws on her rear legs, and this is the first time I've ever noticed them on a dog. I realize that they are removed at birth in some breeds, but I don't remember ever seeing them on even the many mixed breed dogs I've met.
Suja
In
This is probably a stupid question, but I couldn't find the answer online. Are there particular breeds of dogs that are born with dew claws on their rear legs?

yep. some breed standards require rear dew claws. and, IIRC, some (Briards?) have double rear dew claws.
shelly (vicious Borg hag tart) and elliott & harriet http://home.bluemarble.net/~scouvrette
This is probably a stupid question, but I couldn't find the answer online. Are there particular breeds of dogs that are born with dew claws on their rear legs?

Yep. The breed standards for Briards and Great Pyrenees require them, as does the standard for the Beauceron (a French herding breed related to the Briard). It's a form of polydactyly (more than the usual number of fingers and/or toes). It's inherited through a dominant gene with variable penetrance, so it only takes one parent who carries the gene to produce puppies with this trait but that parent may or may not express that trait themselves.
For more information:
http://perso.wanadoo.fr/corine.lundqvist/polydogs.html

Dianne
(& Patience Briard, who has double front dewclaws
as well as doubles in the rear)
This is probably a stupid question, but I couldn't find the answer online. Are there particular breeds of dogs that ... birth in some breeds, but I don't remember ever seeing them on even the many mixed breed dogs I've met.

Rear dewclaws are pretty common, and I'm almost positive GSD can have them - I can't say for sure but I believe the pop up in all dog breeds. My collie mix Dakota has big, loose, ugly ones in the rear, and I know why they remove them at birth!
Bunny looks purebred to me - can't see anything but GSD there.

Christy
This is probably a stupid question, but I couldn't find ... that are born with dew claws on their rear legs?

Yep. The breed standards for Briards and Great Pyrenees require them, as does the standard for the Beauceron (a French ... who carries the gene to produce puppies with this trait but that parent may or may not express that trait themselves.

There is the horror story of this briard owner an the vet who said "these dew claws have to be removed if you want to show the dog..."

On the other, merrier, paw, most dogs that work by running, bird dogs, hounds, terriers have the standards that asks for no dew claws. Some never have them (I remember I had red somewhere that there was a Greyhound pup with dewclaws only once ever in the history of the breed), some have them removed on the day 1. I do not know what happens in Germany where law bans removing?

Ivana Marinkovic >"After the first four years Zagreb, Croatia > the dirt does not get any worse." Http://www.iridis.com/ivanam > Quentin Crisp
My friend had a GSD with them. They were big and ugly too.