Tinsuit

The Tinsuits are knights that take the appearance of anthropomorphic wolves found in The Adventure of Link. Tinsuits constantly move left or right and being hit by one usually results in a loss of experience points, but these enemies are very weak, and a hit from the sword can usually defeat it in one attack.

Trivia
Enemy Keatons from The Minish Cap share similar characteristics to Tinsuits: both have a canidae appearance, are very fast, fairly weak, and steal from Link (be it Rupees or EXP).