Hi all, DW and I are due in the new year with our second daughter. DD1 is 3 and a half and wants to have a part in naming her sister. She'd like to call the baby Ruby and has been doing so since we told her we were expecting about three months ago. The problem is, neither DW or I are sure on it, and she only wants it because she briefly met a dog called Ruby...once 
She's really stuck on it though.
Wanted to get views on the name, whether it's OK to name a child after a dog we don't really know (!), and how to manage her disappointment if not.
Other options we're considering are Isobel and April.
Thanks!