Tell your dad its your dog and nobody has the right to hit him. Or expain to your dad why its wrong and make him understand you doent like it.
If the dog is shitting and peeing in the house try to train him and if it does not work leave the dog outside. If he is tearing up the furniture,buy him a chewing thing or a toy to play with and spend personal time with your dog aswel so.
Have you ever used runes? You can bind him with the rune ISA, so that he can't harm your dog anymore.
Like this: vibrate the rune ISA for 54 or more times then affirm: " Name_of_your_father is permanently bound and can't harm name_of_your_dog in any way whatsoever"