It's day four of the Puffle Party! Click on the Puffle Progress tracker in the upper-right corner.
Select "Go There!" under the Red Puffle box, and you'll be taken to the Beach.
From here you click on the stand and you'll get this pop-up message:
From here you can obtain the Puffle Vet Coat and the Vet's Head Mirror.
That's all for today! Check back tomorrow for more information, and happy Easter!