Question: are all pure white cats deaf?
Answer: Congenital sensorineural deafness occurs commonly in domestic cats with a white coat. ... According to the ASPCA Complete Guide to Cats, "17 to 20 percent of white cats with nonblue eyes are deaf; 40 percent of "odd-eyed" white cats with one blue eye are deaf; and 65 to 85 percent of blue-eyed white cats are deaf."