What serious health complications can arise if a puppy inherits the double merle gene?

Answer

Blindness or deafness

The genetic marker for merle, the 'M' gene, can tragically lead to serious health complications like blindness or deafness if a puppy inherits the double merle gene.

What serious health complications can arise if a puppy inherits the double merle gene?
rareDogtypebreedChihuahua