Barney and his friends help Mr. Boyd prepare his dog Bingo for a trip to the veterinarian for a check-up, but he's hiding in the tool shed. Everyone learns lessons about caring for dogs as they help Mr. Boyd search for Bingo. Meanwhile, BJ is searching for his missing baseball, which he suspects was buried by Bingo. Other visitors to the park include Miss Duffy, a sight-impaired friend of Barney's who introduces the children to her guide dog, Kellie. A visit from Mr. Steele and his multitude of Chihuahuas prompts Barney to show the kids about a wide variety of dogs.