Pet mice are curious, active, and social animals that thrive best when kept in same-sex pairs or groups. They need a spacious, well-ventilated cage with plenty of hiding spots, tunnels, and chew toys to keep them mentally and physically stimulated. A balanced diet of quality mouse pellets, supplemented with small amounts of fruits, vegetables, and grains, will keep them healthy. Regular cage cleaning is important to maintain hygiene and prevent odor buildup.