This playset is meant for ages 4+. It shouldn't be made accessible to kids less than 4 due to the small size of the two pets that come included with this set.
The specialty of the Littlest Pet Shop line of toys is that you can purchase additional sets and attach them to this particular set as they are stackable. The Littlest Pet Shop Display and Play Round 'n Round Pet Town set retails for $29.99, a pretty reasonable price considering the fact that it has been designed as an expandable set.