Her fur has gotten lighter. :3

It's so cute when she pounces at your finger, seems so playful, even though it comes from her instinct to hunt. My cat does that too when putting my finger between planks like in the video, but she claws at it seriously, so I needed gloves to not get hurt It seems Dasha is never overstepping boundaries (at least in the videos shown), is she 'trained' so well, as far as that's possible with a fox, or is it because she is so close to you that she won't hurt you with claws or teeth?

No, she was never trained. She was born like this. Of course you can train foxes. There are lots of Videos on YT that show what is possible with them. But I won't do that with Dasha. I find it quite stupid to train them to do things like running in circles, stand on their hind legs and crap like that! It simply makes no sense and has no use. And, yes, she never oversteps boundaries. The only bad thing she does sometimes, is jumping right into your face when playing. Her claws can hurt quite a bit actually. They are not as sharp as those from a cat, though. Especially in summer, when you only wear a shirt and she jumps onto your back, her claws leave thick red stripes on your skin.