Don’t know about a dog being born again, but I have no doubt they can see angels and know the Master when He’s nearby.
Reminds me of the old Twilight Zone episode about the guy refusing to go to heaven if his dog wasn’t allowed in. Further down the road he found that the dog wasn’t allowed in because it wasn’t really heaven.
Animals are not fallen, the earth is under a curse until the Return of Messhiah, and they can’t wait.