In the story "Emergency Duck" Donald works at the Duckburg Zoo as a caretaker, aided by a rather cute female duck dispatcher named Penny. He is extremely successful, but this draws the ire of the zoo's cleaner, Bob, who is stuck with all the dirty and smelly jobs. So, Bob tries to sabotage Donald repeatedly by trying to get the animals to attack him, but fails as they all love him too much. Eventually, Bob goes to the dispatch room and ties up and gags Penny, and pretends to be her to trick him into feeding the zoo's lion, King Ruff, a steak covered in hot sauce. Eventually, Donald is saved, Penny gets free, and Bob is arrested, while Penny gives Donald a kiss on the cheek.
Source: https://comiconlinefree.net/walt-disney-s-donald-duck-and-friends/issue-312/full