If I line-dry 2 loads a day, and my dryer uses 2100 watts, that saves 4200 watts a day just on pet laundry. It's much better for the planet, and also takes some strain off the electrical grid, because where I live they have frequent problems with the grid and keep calling for us to conserve to avoid rolling blackouts.
In 1995, I had my first handicapped dog, and I was doing 3 twin blankets a day, and hanging them on a makeshift clothesline strung across the corner of the fence. I've wished for a real clothesline ever since. My wish finally came true!