My 7 year old child has very large pupils even in bright light she wears glasses regularly and I've never seen this happen before. She did get bit by a small dog two days ago.

Probably . Probably not a big issue but could have gotten something iin her eyes that caused it--if this does not resolve, have her seen by an ophthalmologist just to be sure.
Children . Children usually have large pupil. Our pupil size tend to get smaller as we get older. However, if there is a change in the size of the pupil she should be evaluated by an ophthalmologist.