dogs with blue irises or missing tapetal pigmentation are more likely to be deaf.
The other two issues can not be solved without robbing Dalmatians of their signature looks: their spotted coat.
Deafness in Dalmatians isn’t caused by over-breeding, popularity swings, or backyard breeders.
To be a Dalmatian is to be prone to deafness and to be predisposed to suffer from mental disorders caused by insufficient melanin.