I'm glad you called the vet too. Even if a few nuts wouldn't bother them, those chewed up shells couldn't be good. Mine both love cashews and will sit and beg for them. Apparently, in addition to chocolate, grapes are a HUGE no-no for dogs, also raisins. It's funny, but when we were kids we had a dog who would stand up on her hind legs and eat the grapes right off the vine!
And I will never give mine any kind of rawhide chewies again! My oldest Boston, Ragan, chews them till they're all gummy and nasty, then tries to swallow them whole. She had one of those that's a long strip of rawhide with knots tied on either end to make a bone shape. In no time she had the knots undone and chewed until it was floppy - then she tried to swallow it! I heard choking sounds and found her sputtering and gagging - one short end was hanging out of her mouth and the other end must have been all the way down in her stomach, and she couldn't breathe! I grabbed it and pulled ... and this eight or nine inch strip of rawhide came out! It just kept coming and coming ... And that's the LAST time they ever got rawhide to chew on! If I hadn't been there when it happened, she would have died!
It's funny you should mention a bumper crop of pecans this year! A lot of people on the dog-related board I go on have been mentioning how there are so many acorns falling from the oak trees in their yards this year ... the broken shells hurt the dogs' feet and they refuse to walk on them! They have become little "pavement puppies".
