The dogs look like castle crowns on the gears. They engage adjacent gears to connect the two gears. Here are two good videos to see them, and how the transmission works:
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-2022 5 speed Templar X Orange, OEM 51T rear sprocket, 14T front sprocket
-NOS 2020 KTM 250SX (2-stroke motocross), less than 10 hours on it
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