Since Java 1.8, tamed wolves will attack skeletons by themselves, even if the player never attacked or got attacked by them. Skeletons run away from wolves at a similar speed, causing wolves to chase them for long distances and stop following or teleporting to the player. This continues until the skeleton is killed (which usually takes a while without player intervention) or despawns; a player on low render distance may run out of range before either happens, causing the wolves to be stuck in unloaded chunks.
While it may be amusing to see a pack of wolves ganging up on a skeleton, it makes them less usable as following pets if they keep wandering off on their own, or you have to kill every skeleton you come across to prevent that.
(Wolves not following players while attacking skeletons is considered intentional; see https://bugs.mojang.com/browse/MC-58312)
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