The Shaggy Dog (1994)

Preteen Moochie Daniels just wants a dog but his dad Daniel is allergic to canines like Bundles the shabby sheep dog of neighbor Charlie Mulvihill who secretly trained his pet to help him steal jewels Moochs big brother Wilbert Wilby is smart shy and a promising inventor but hopelessly clumsy when it comes to girls and is jealous of his slick mate Trey who has no problems Desperate Wilby resorts to a spell from the ring of Lucrezia Borgia he accidentally got from dads museum of curiosities which magically turns him into Bundles and back at uncontrollable times This is how he also knows that the diamond on loan in his fathers museum is Charlies next target