Samba (サンバ) is Roberto's puppy.
Samba, being a puppy, is very energetic and sometimes unknowingly causes trouble. In his first appearance, Who Stole My Shoe?, he ran away from home and took everyone's shoes. In Ham-Ham Halloween!, Roberto dressed him up as a monster to scare Laura & Kana. He seems to be good friends with Brandy (much to Laura's dismay), playing with him in The Milky Way. In Duel at the Flower Ranch, Pepper attacked him and Roberto after Samba licked her. He makes a brief appearance in The Talking Dog Cookies, in which Hamtaro gives him one of the cookies to ask why Roberto and Laura fight. Samba says that Roberto really likes Laura, but Roberto comes back before he can finish.