Why does the post-medieval skull in the video have such bad teeth?

Post-medieval people did not take the best care of their teeth. Poor diet combined with poor hygiene practices lead to tooth decay and tooth loss. Many people of the time were wholly unaware that poor oral hygiene can lead to other health problems so taking care of them was not a priority.

Used to water and cool climates, probably not thick coated or fluffy. they most likely have thin coats and have to survive to find food. sorry if this wasn't the answer you were looking for..: )