a rabid wolf

• 2265, 869, 3 (seen once)
• 1312, -475, 96 (seen once)
• 1207, 615, 38 (seen once)
• 1148, 704, 89 (seen once)
• 735, 629, 20 (seen once) (1 of 3 spawns here)
• 1244, -443, 84 (seen once) (1 of 2 spawns here)
• 1659, 1020, -64 (seen once)
• 2995, -691, -42 (seen once)
• 2852, 892, 17 (seen once)
• 2392, -150, 50 (seen once)
• 2004, 526, 35 (seen once) (1 of 2 spawns here)
• 2830, 615, -2 (seen once) (1 of 2 spawns here)
• 1972, 648, 88 (seen once)
• 1168, -652, 14 (seen once)
• 766, -602, 27 (seen once)
• 3371, 749, 57 (seen once)
• 2358, 745, 45 (seen once)
• 2097, -707, -50 (seen once)
• 3699, -742, 72 (seen once)

As /loc gives them: Y, X, Z, the most used first; nearby spawns share a spot, and one seen in a single visit may be where the mob had been pulled to.