Even if your bird does not have any visible injuries that you 'see', there can be internal injuries. A vet visit is definitely a must...
And a serious talk with your sister and your parents if you still live at home. I am not an advocate for punishing the dog, its their nature, so not his fault, but if your bird is fine, for the future, make it known if the dog is allowed into a part of the house that is 'dog free' or the bird's area, physically remove the dog. Guessing a small poodle? So pick the little bugger up and drop him outside in the yard or into a crate if he has one. And tho I don't suggest physically hurting the dog, I wouldn't be upset to hear about you kicking your sister in the behind.