Great Danes

Our dog Daisy started about two weeks ago going to the same spot in our yard and barking and circling the ground. We took her to the vet because she was losing weight. We figured out that she wont even leave the spot to eat. We burned the area thinking that maybe there was a scent that was driving her crazy and we even dug up the dirt. Daisy used to poop in the same corner located in the back left corner of our yard. We have now started to notice she wont even leave the spot long enough to go poop. The spot is located at the front right side of the yard. We have tried to play fetch and run with her in the yard and she shows no interest in anything but "the spot" It's becoming really annoying because we have fun out of ideas of what is making her do this. Any ideas or suggestions? PLEASE Help!! Thanks!!!

Sorry have no ideas for you as to what may be wrong. Maybe there's a ghost that hangs out in that "spot".