Pal's siblings

Pal's siblings are the other golden retriever puppies given birth to by Perky in "Arthur's Pet Business." It is unknown what happened to them after the episode, since only Perky and Pal appear later in the series. They likely were adopted or sold to a pet store, possibly Al's Pet Shop.

Considering the statement Arthur once made that Pal is lucky he "(doesn't) have a sister" in "The Chips Are Down", Pal's siblings might all be male. Alternatively, Arthur could have meant that Pal doesn't have a sister living with him.