Small dogs generally require less exercise compared to larger dogs. About an hour a day should do it for these breeds, although some need more of a workout than others. Poodles and Terriers are usually more active throughout the day than other dogs of their size.
Chihuahuas, on the other hand, are one of the smallest breeds, yet, contrary to their body size, they are packed with energy. All types of Chihuahuas need to release their pent-up energy regularly, so while they don’t need long ones, they do need regular ones.
Some exercise ideas for your small dog:
Walking
Playtime
Puzzle games
Dog park