It looks like you all had a fine Valentine's Day Pun Party yourselves! You have no idea how long I have tried to come up with a joke. But all I can think about are the Have-A-Hart animal traps. So here goes:
Peter Rabbit gave a Valentine's Day card to Farmer McGregor. What did it say inside?
Have a Heart! Use a Have-A-Hart!
So, there. That's my second joke I ever made up in my life.
An excellent pun for deer friend to make! Be proud!