Refrigerators are for food, of course, but as everyone knows they are also for putting up things that you want to remember.  Or, as in the case of children's artwork, things that they want to have remembered.  Whatever the case, you will need some magnets and what better a magnet especially if you have a cat or dog than one that expresses a pet sentiment.  

The paw shaped red alder magnets are plenty strong and they only cost $5. 

What a deal!