Because we haven’t seen one in a while.
An anecdote I ran into on reddit recently (here):
Because we haven’t seen one in a while.
An anecdote I ran into on reddit recently (here):

I was at a dog park after dark the other day, and I spent a good two minutes 'dancing' with a border collie. I'd jump right, and he'd jump over in front of me. We never touched each other, just mirrored each other's movements. It was fun.
Looks more like a Karelian bear dog to me.
Good god, you’re right, it does.
I’ve never seen or even heard of one before. I wonder if it really is?