Molly examines her shelf of special things at the back of Mack's stall. She chooses the little toy donkey and remembers the day she got it.
Molly and Mack are visiting Daisy at the vet's when she gets a call from Mrs Anderson. Daisy seems a little stressed by this, so Molly and Mack decide to follow her to the farm to find out what's going on.
At the Kids Club, Moira finds Lennox's jokes hilarious, but unfortunately not James's. James takes this as a challenge - he must make Moira laugh.
Back at the farm, Mrs Anderson tells Daisy about Thistle, her donkey, who has something stuck in her hoof. Hiding nearby, Molly and Mack watch, confused at how nervous Daisy is with Thistle. Her subsequent sneezing fit leaves Molly and Mack even more mystified.
James's finest puns are having no effect on Moira. Mack tries to get Daisy to talk about what's going on. Molly soon realises what could be wrong with Daisy, and she decides they need to do some research.
At the Wobbly Coffee Pot cafe, James finally finds a way of making Moira laugh.
Molly thinks she knows what is up with Daisy, and she and Mack go back to the farm to help. Daisy confesses what her problem is with Thistle. She's allergic to donkeys but was too embarrassed to say. Mrs Anderson reveals that she has a similar problem with her Highland cow, and Daisy doesn't need to be embarrassed at all. Mrs Anderson suggests Daisy wear a mask, and soon Daisy can fix Thistle's hoof.