It's nearly 40 years since The Anthony Nolan Trust was set up.
Despite their ever-growing list of willing donors, they estimate that half of those in need still die for want of a suitable match. Callum Watkinson met one man from Birmingham who says he owes Anthony Nolan his life.
Here's a selection of photos you've taken of your pets getting dressed up for the ITV1 charity programme Text Santa, which is on tonight.
Text Santa is conducting the Biggest Bag Pack Ever for 6 UK based charities that provide help and support to someone near you.