What are some health dangers for teacup puppies?

Due to their size, teacup puppies are at risk of drops in blood pressure that can lead to death, loss of vision, heart trouble, seizures and respiratory issues, notes Animal Planet. The likelihood of these problems can increase as teacup puppies age.

Teacup puppies sometimes have mouths that are so small there is no room for their adult teeth to come in properly, states Animal Planet. The fragility of their bones can lead teacup puppies to have underdeveloped craniums with soft spots, and the puppies can break bones during otherwise harmless activities such as jumping off sofas or playing with children. People may have difficulty house training teacup puppies, as they have very small bladders.