Elmer no Bouken: My Father's Dragon
English name: Elmer's Adventure: My Father's Dragon
Genres: Adventure, Fantasy
Type: OVA, Episodes: 1
Aired: Jul 5, 1997
Studio: Aubec
Source: Book
Rating: G - All Ages
Synopsis:
Elmer is told by a traveling cat about a baby dragon who is being held captive and mistreated on the scary Wild Island. Elmer decides to investigate and battles tigers, crocodiles and gorillas in order to rescue the little dragon. 

(Source: inbaseline)