Dumb and Dumber - watch online: streaming, buy or rent
Currently you are able to watch "Dumb and Dumber" streaming on Max. It is also possible to buy "Dumb and Dumber" on Apple TV as download or rent it on Apple TV online.
There aren't any free streaming options for Dumb and Dumber right now. If you want know when it is streaming for free, click 'Free' in the filters above and hit the notification bell.