Big Pets (ビッグペッツ Biggu Pettsu) is an amusement park guide robot that was stolen and modified for combat by Dr. Wily, appearing as the boss of Wily Stage 1 from Mega Man 5. It shoots enemies from its head in varying patterns, and if a section of its body is shot, it launches toward Mega Man. Its eyes are the weak spot, and Crystal Eye is the best weapon to use, as well as a charged Mega Buster shots. Big Pets can only be harmed while its eyes are open.
- The name and design of Big Pets may be derived from Pez (ペッツ Pettsu), a candy dispenser that may have the head of a character on the top.