Can confirm that this is occurring in 1.6.4 unmodified singleplayer survival.
Untamed wolves follow passive mob spawning behavior (spawn with the world, do not spawn again unless the player commits genocide against all passive mobs in a large area and on a very slow cooldown), but follow hostile mob despawning behavior (disappear from loaded chunks when a suitable distance from the player after a decent length of time).
Wolves are, as a result, ridiculously difficult to find, since they need either excessively complex mob-farming, or require the player to tame the wolves shortly after loading their chunks.
Host24
Can confirm that this is occurring in 1.6.4 unmodified singleplayer survival.
Untamed wolves follow passive mob spawning behavior (spawn with the world, do not spawn again unless the player commits genocide against all passive mobs in a large area and on a very slow cooldown), but follow hostile mob despawning behavior (disappear from loaded chunks when a suitable distance from the player after a decent length of time).
Wolves are, as a result, ridiculously difficult to find, since they need either excessively complex mob-farming, or require the player to tame the wolves shortly after loading their chunks.