BCMixs:
"Feet are somewhat longer than the front feet, turning neither in nor out, equally compact with well arched toes. Pads are thick and hard. Nails short, strong, and black. Dewclaws must be removed." American Rottweiler Standard, 1990 http://www.amrottclub.org/rottweiler_breed_standard.shtml
The standard (both Canadian or American) doesn't mention about rear back dewclaws, but I have heard/read of several breeders who mention the removal of dewclaws, specifically the rear ones.
The puppies to me don't look much like Rottie crosses, but more like Australian Shepherd x, or even Kelpie type mixes.
"Front dew claws may be removed. Feet are oval, compact with close knit, well arched toes. Pads are thick and resilient." United States Australian Shepherd Association. This to me has an open interpretation, indicating that Aussies can/occasionally do have rear dew claws. http://www.australianshepherds.org/akcbreedstandard.html


In Memory of:
Cleo (1994-1999) & Dacota (1995-1999)
"Great dogs in every sense of the word".