Why are dogs haram? And do we have to pray sunnat that are and aren't muakkadah?
On dogs please this previous answer.
Non-muakkada sunna deeds are still recommended, but you do not have to do them. They are not obligatory and they are not strongly recommended. But they are still good deeds and you can choose to do them.
And God knows best.
Asking questions is temporarily unavailable. Sorry for the inconvenience.