Robert John Ward, 66, was arrested Monday for alleged bestiality. Deputies began investigating Ward after a family member called authorities with the allegation.
Ward admitted to a deputy that he had touched the dog inappropriately and that he'd had the dog perform sexual acts on him, according to the sheriff's office.
A vet examined the dog and found that her anal glands were swollen, the sheriff's office said.
The accusing relative said the dog had been acting strange for several weeks.
Ward's being held without bond at the Rappahannock Regional Jail.