The Shaggy Dog Movie Wiki

His family, ignorant of Dave's new canine form, speak freely in his presence, leading Dave to realize that he is estranged from them. In particular, he learns that his son Josh (Spencer Breslin) wants to sing in the musical Grease instead of playing football, but is too scared to tell his father so.
In the ongoing trial, testimony from the activist accused of setting the lab on fire includes a description of the animals behaving like dogs, which sparks Dave's suspicions about the company he is defending. When his dog-like behavior annoys the judge, Dave is removed from the case. He then decides to take matters into his own hands and infiltrates Grant and Strictland headquarters while in his canine form.
Hidden in the laboratory, Dave witnesses Dr. Kozak injecting the ailing Strictland with a drug that will paralyze him for several months, giving Kozak enough time to usurp control of the company. After viewing security cameras, Kozak and his minions realize that somehow Dave became an exact copy of Khyi Yang Po.