Wikipedia has more on Cynophobia.
Cynophobia
Cynophobia (from Greek kyon, "dog") is the fear of dogs. The most common cause of cynophobia is getting bitten by a dog, but other common causes include annoyance of barking and getting asthma attacks from danger. Sufferers would not have dogs as a pet, while if there is dog in the house they would either get the dog out of the house or stay in the room behind close doors while covering ears so they don't hear dogs barking.
Cynophobia can be treated themselves using self-help, otherwise they may need professional assistance, like the use of systematic desensitization therapy or exposure therapy.