The "All I Wanna Do" singer planned to donate a portion of the proceeds from her July 22 concert at the Cheyenne Frontier Days to a wild-horse protection group that's suing the government to try to halt a big mustang roundup in Nevada.

Crow is the opening act for Kid Rock on a summer tour that includes the Wyoming gig. But Showing Animals Respect and Kindness claimed that wild horses are abused at that event in a special race just for them. "How can an organization dedicated to helping wild horses take blood money that was based, in part, on abusing wild horses? We believe what Ms. Crow is doing is nothing but PR spin," said Stuart Chaifetz, a spokesman for the Illinois-based group.

The group, also known as SHARK, called on the Cloud Foundation to reject the donation.