Barbie calls Marmaduke and tells him that she has a treat for him. Marmaduke comes running and is excited until she tells him that he is getting a bath. Marmaduke runs off and into the neighbor's (Mr. Snider) yard and get chased out by Mr. Snider. Marmaduke lands in the tub of water and Barbie gives him his bath.
Barbie takes Marmaduke out for a walk and Marmaduke sees a female bulldog named Missy being walked by her owner and instantly falls in love. Barbie knows that she can't control him when he gets like this and Marmaduke follows Missy home.
Marmaduke find out that Missy has a male bulldog that lives at the same house with her and he doesn't like Marmaduke. He chases Marmaduke away. Marmaduke tries to lure Missy away and the male bulldog sees this and uses a water faucet and fills Marmaduke up with water and rolls him down the hill.
Marmaduke is sad and upset about not being able to see Missy and suddenly he hears her whimpering like she's in trouble. Marmaduke runs over to her house and sees that she has fallen into the pool. The male bulldog is scared of water and runs off. Marmaduke rescues her and she is grateful. Marmaduke follows her to her house and sees that she has several puppies and Marmaduke runs back home after seeing them.