This is an Anti Wolf Heck Collar. The purpose of the collar is to protect the dog wearing it when and if it has to fight wolves. The collar base protects the dog's throat and carotid arteries, while the spikes are intended to deter bites to the neck or even injure wolves trying to do so.

A 4500 pound shark choked to death on a sea turtle

Whale fossils found in the Egyptian Sahara desert
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Fascinating time-lapse of a salamander growing from a single cell, into a complete, complex living organism over three weeks
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Strawberry time lapse
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Different channels and different ads
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American soldiers watch the eruption of Mt. Vesuvius, 1944.
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Extracting electricity from a tesla coil using a syringe
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The world's largest fire works
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Natural selection vs artificial selection through breeding
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