I've never had a problem with my dogs who regularly feed on bird seed. Makes their poop colorful, but never had a problem...but then I've never been worried about it either.

Bears eat the seed from feeders, bags, and off the ground so it isn't poisonous but I do think it could cause issues with the intestines (blockage or the reverse) so keep an eye on her.

My 5 y/o, Conner, accompanies me on feeding rounds every morning and night. We feed BOSS (black oil sunflower seeds), scratch (mix of corn, wheat, and other grains) and pellets to all our chickens and turkeys. Plus the goat pellets and the rabbits pellets - all of which get cleaned up by Conner or Eli (10 y/o Lab).

None of it is toxic, even with shells on, to the dogs, but depending on how much they eat, I would be concerned about blockage. My guys don't get enough to cause any problems - just whatever happens to fall out of the feeders - but if your girl was happily chowing down, I'd watch her.

Like someone said above, it does make so for colorful poop in the yard, tho!