What happens to pets when couples break up

Legal systems in most countries are set up to decide what happens to children and personal possessions when married couples break up. But what about the pets in the family?

I'm doing some research for an article I'd like to write about what happens to their pets when couples break up. I'd like to hear about personal experiences or the experiences of someone you know, or even someone you may have heard about. Just leave a message in the comments section, and I'll add it to my collection of information.

I'd really appreciate any information you can give me. Thank you.