I only saw one episode
I only saw one episode of this fantastic series cause my grandma taped it before I was born ^^ It was the Magic Scalpel episode, where David found a magical scalpel that belonged to his ancestors, and saved himself from venemous spiders by making them sneeze and pass out :)
For some reason I was under the impression that Swift died and David found another young fox as a new friend. Apparently this did not happen :)