The Beagle and I

It is a 1999 film.
Cast
Roxy - Anna Leonowens
Snoopy - King of Siam
Principal Cinch (Friendship Games) - Kralahome
Sour Sweet - Master Little
Charlie Brown - Louis Leonowens
Linus - Prince Chulalongkorn
Flora - Tuptim
Woodstock - King's Panther