Fairfax County Police have charged a 17-year-old Herndon-area boy in connection with the on May 26 and April 26.
Based on a tip investigators received on Friday, officers arrested the teen on Saturday around 4 p.m. at the Reston Police District station, police said.
WJLA TV reports that a 22-inch machete was recovered when police made the arrest.
The youth has been charged with four felony counts of maiming animals, three misdemeanor counts of cruelty to animals and two counts of unlawful entry.
In the May 26 attack, two goats, a calf and a chicken were injured at Kidwell Barn in Frying Pan Park. The in a barn adjacent to the park.
The Friends of Fairfax County Parks offered for information leading to suspect. FCPD spokeswoman Lucy Caldwell says the reward is usually collected upon conviction.