Dalmatian dogs are not all deaf, contrary to popular belief. Around 30% of Dalmatians are born deaf. This is due to a genetic mutation that affects the way sound travels to the dog's inner ear. While all Dalmatians have this mutation, it only results in deafness in some of them. If you are considering getting a Dalmatian, be sure to have your dog tested for hearing before bringing him home. That way, you'll know what kind of care your dog will need and can provide it accordingly.