Oliver is a little Dachshund appearing in Ginga Nagareboshi Gin.
Oliver is comical and a bit silly dog. He is friendly and laid-back and a great digger.
However, he can be serious opponent if he attacks, and he indeed does so while protecting Cross. He also showed sense of justice as he was ready to help and fight for a stranger. He tends to use human vehicles for traveling long distances.
Ginga Nagareboshi Gin
Oliver helps defend Cross against Rokusuke and Bess who tried to force her to become Rokusuke's mate. As Gin, Benizakura and a pregnant Cross heads towards Mutsu to come Moss's to aid Oliver helps them get a ride onto one of the trucks to Mutsu.
He then joins Gin claiming he wants to be cool as well. When Cross gives birth Oliver helps her and stays with her to help her with the puppies.
He does not appear in the battle against Akakabuto.
Ginga Densetsu Weed
Oliver himself does not appear in the series, but his son Mole does.
In an attempt to rescue Gin, Mole states that Oliver is still alive and would be happy to hear of Gin's escape.
See more pictures in Oliver/Gallery