The 79-year-old Nelson was scheduled to perform Saturday at a private home in Castle Pines Village, Colo. The benefit was for an organization that provides animal care and shelter in the Denver area.
The host of the fundraiser, Fred Bartlit, told The Denver Post that he was informed that Nelson was taken to the hospital after having trouble breathing.
But Elaine Shock said Monday that Nelson was not hospitalized and no other concerts will be canceled. His next performance is scheduled Tuesday in Dallas.