Spike is the Pickles family pet. Tommy claims him to be his best "animal" friend. The character is considered a main character in the series, appearing in almost three quarters of all of the episodes, though he usually does not come along when the rugrats venture to new locations. It is mentioned that his breed is the fictional Siberian Tiger Hound, which is in universe an extremely rare and highly valuable breed of dog worth thousands of dollars. As shown in The Rugrats Movie and Rugrats Go Wild, Spike is very protective of the babies, as he sees them as his "babies", during Rugrats Go Wild, he is ashamed because he lost his "babies".