Boltund is a quadruped, canine Pokémon. Its two front paws are white with a yellow stripe atop each white part that leads to its black legs. Its back two back paws are a darker yellow with a lighter yellow on top of it that also leads to black legs. It has a thin yellow tail and hind legs with two spikes on the top of each of them. The bottom half of its body is mainly black, while the upper part if mainly yellow. Boltund's head is yellow with white markings that extend over its muzzle, under its eyes, and in between its eyes, going up to its forehead. This said white spot also goes down and ends in a triangle shape on its front chest. Its eyes are yellow, mint-green, white, and black with no real distinct pupil. An outer ring of a light yellow is also positioned on the top of each eye. The inside of its ears is yellow with an outer ring of black. The black and yellow halves of its body connect on Boltund's shoulders, with the yellow part drooping down in its front to cover Boltund's underbelly.
Boltund can channel the electricity that it generates to its legs in order to keep them strong, boosting its strength and allowing it to run nonstop for three full days. It can easily run faster than 50 mph at top speed. It serves as the enemy of Thievul.