Imagine arriving home late after a long day at work, looking forward to collapsing into your nice warm clean bed for a few hours because you have a very short turn-around before having to go back, and seeing that your dog buddy has gotten sick all over his own bed while you were away.
Yes, you could just go to bed and wash that tomorrow, but then your pal would have to go without his bed for the night. Compassion is what makes you spend half an hour hand-washing that bed cover and waiting for it to tumble dry so that your friend can sleep on a nice warm clean bed too.
Or maybe that's just spoiling the dog...I don't know. I'm too tired to think about it.