How do people do this to their pets?

Neglected dog confined in 'prison of its own hair' - just not right on any scale! 'Before' and 'after' photos.

At least this ends well - the RSPCA seized the dog and removed its coat. Admittedly, it's going to have a cold winter because they had to shave it bald but at least it's now in good hands.

I can see me wearing one of these

Dr. Manhattan Deluxe Mask. Of course, I might have to wear a bit more for the rest of the costume! ;-)