This hoverboard doesn't have any unlockable upgrades.
Hotdog is a limited hoverboard released with Subway Surfers World Tour: Chicago. Like any other hoverboard, it protects you from crashing for 30 seconds. When crashed, the hoverboard will explode and need to recharge for a few seconds before using again. It has the appearance of a hot dog. Like most of others limited hoverboards, it costs 50,000.