The invention recites spirocyclic isoxazoline derivatives of Formula (V.1), Formula (V.2), Formula (V.1.1), and Formula (1) stereoisomers thereof, veterinarily acceptable salts thereof, compositions thereof, processes for making, and their use as a parasiticide in an animal. The variables A, V, Z, W1, W2, W3, W, Y, X, R1a, R1b, R1c, R2, R3, R4, n, and " are as described herein.