Wolfos

Wolfos are recurring enemies in the Legend of Zelda series. They are a race of wolf-like monsters that frequently appear in forested areas. Wolfos sport shaggy brown fur coats and glowing, pale, yellow eyes. They are very adept at blocking and dodging Link's sword attacks.

Wolfos attack by circling Link at a distance, then charging in to attack with the claws on their front feet. They are very agile, backflipping over some attacks, but they can also block attacks by hiding their head behind their forelegs. To take down a Wolfos, Link must either block or avoid its attack, and hit it before it recovers. Striking a Wolfos on its tail requires accurate timing, but defeats a Wolfos in one hit if successful.

The Legend of Zelda: Ocarina of Time and The Legend of Zelda: Majora's Mask
Wolfos share the same appearance and attack patterns in Ocarina of Time and Majora's Mask.

In Ocarina of Time, they are most often found in remote forested areas, such as the Sacred Forest Meadow or the Forest Temple, though they can occasionally be found in hidden caverns and other dungeons.

In Majora's Mask, Wolfos are found in the Snowhead region of Termina after Link has defeated Goht and returned spring to Snowhead. They appear where White Wolfos would appear during winter. Wolfos also appear as targets in the Southern Swamp Shooting Gallery.

Theory
It is possible that Wolfos are tamed to act as guard dogs in Ocarina of Time. This seems likely because they can often be found guarding the entrances to important areas such as the Sacred Forest Meadow and the Forest Temple. Also, one of their close relatives, the White Wolfos, can be found guarding the Iron Boots in the Ice Cavern.