So far my doggo is afraid of the TV, dishwasher, and computer. The computer one makes me laugh, as she's developed a psychic trait apparently to know when it gets turned on, even while she's downstairs and the computer is upstairs. She'll abandon whatever she's doing to run upstairs for the sole purpose of whining and cowering at the computer while my sim uses it. The TV one is slightly annoying. My sim just wants to watch her movies, please stop making me feel bad for having it on. :(
She loves the radio, however, and will sit and listen to it when it's on. There's something else she enjoys but I forgot what it was, will have to keep an eye out for it!