When I first adopted Sockmonstah, I didn't know much about him/her.

Later, I assumed Sockmonstah got their name because he/she had a record of well... Stealing socks from other peoples houses, and stashing them under its bed.

So, it may not have been so hard to understand why Sockmonstah had been left at the pound... Or perhaps his/her older owner had not been able to take care of them.