there actually is no such thing as dwarf turtles. the turtles that are often refferred to as dwarf turtles are red-eared sliders, that are taken while they are young and sold on the streets. these turtles can grow up to 7 inches
They are found in cold Quick flowing streams. They are smaller, whice exsplains the name. Some people dont realize that they can reach around ten feet in length. They are not endangered but harder to find.
Dwarf turtles that you can get are Dwarf Musk Turtles, they only grow up to 7 inches and are native to canada and tend to live in river environments :) nicknamed Skinkpot because of the odour they release when threatened!
There is no such thing as a dwarf turtle. If you want a turtle I would suggest a terrapin or a red eared slider. The sliders are more popular but the terrapins are easier to feed. Just feed them worms and fruit.