Graceful, alert and swift-moving with a saucy expression, Chihuahuas are highly intelligent and should not be underestimated even though small in size. They are good with families if the children are gentle and patient. Because of their small size, they require little exercise and are good apartment dogs, but can be sensitive to cold temperatures. Smooth coated Chihuahuas need very little grooming due to their short hair. Long coats need occasional brushing but still require minimal grooming.