I have a teleporting machine (star trek style) with command blocks on my server that can teleport people a couple hundred blocks away. when I have a wolf or a cat following me to the teleporter and I teleport away 8/10 times the wolf won't come with me.
This issue is also present with boats. When you're in a boat and float on the sea in a straight line for 10 minutes while a wolf is following you it won't allways teleport to you once you reach land.
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I know, we are in a rendered chunk, then I tp 300 blocks away, and the wolf didn't tp to me. or we are in a rendered chunk, I get in a boat, the wolf wont tp to me once i reach land

When you TP more than a chunk or two away the original chucnk can instantly unload, if no player is still there so your wolf wont TP cause he is now unloaded. With boats its the same way. You can out run your wolf ability to TP thus putting him into a chunk that unloads. Of coarse hiting land wont make him TP as he's unloaded. This issue has actually been around since 1.4.7 (maybe even a version before that). And wolves submerging and surfacing in water can actually freeze there ability to TP as they need a solid block withing a 1x3 area under them to TP properly (Enderman Syndrom).
If you watch the UHC Minecrack Guys it becomes aparent in the Season 10 Teams battle when Vintage Beef and his group were trying to move about 15 wolfs across an ocean. Someone had to keep chunks loaded for them to TP. They run Server 1.4.7 for there UHC do to a few bugs still being worked out such as minecraft consuming two food at once and counting as only one consumed, when lag hits which is bad as the only way to get health back in UHC is with golden apples (also they are scared of overpowered skeletons killing them off early)

Is this still a concern in the latest Minecraft version 14w03b? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Is this still a concern in the current Minecraft version *14w11b / Launcher version 1.3.11 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Is this still a concern in the current Minecraft version 14w21b / Launcher version 1.4.4 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Duplicate of MC-55661 due to better/more general information.
If the wolf is left in an un-rendered chunk they wont teleport. however if the chunk is rendered and a player moves slowly the wolf will teleport.