If you are in single player you can see them for a split second not under the sand once in render range. If you have an imprint multiplier for your game set to 20 a 100% imprinted direwolf should suffice. Flying (cheat/command) also has the speed needed to quickly spot them render in. This does depend on hardware and device, I am using a gaming laptop for that with the game in an external hard drive. On another note most I have encountered seem to stay in one area for a small amount of time once rendered in before disappearing.

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