Depending on how they’re bred — which is often through unethical means — teacups have a host of health problems. Common issues can include blindness, collapsing trachea, digestive problems, heart defects, hypoglycemia, seizures and respiratory ailments. They may also develop hydrocephalus (water on the brain), which is already an issue in smaller breeds.
Poorly bred teacups can also have liver shunts — congenital birth defects affecting their ability to flush out toxins. Treatment for this ailment can cost thousands of dollars and isn’t always successful.
Small dogs (both toy and teacup) are prone to gum disease and tooth problems. Sometimes, their baby teeth don’t fall out on their own and have to be pulled.
They may also suffer from patella luxation (i.e., a sliding kneecap). This can affect their ability to walk and makes them more prone to arthritis over time.