You need to change your Country to one that uses Imperial (USA) in the Wii Setup Menu.
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There is now the Wii Fit Plus (an addition to Wii Fit) which allows multiplayer mode.
In Wii Fit Plus, you can add your pets, such as your dog.
The Wiimote Plus attachment will not fit in the Wii Steering Wheel however the new wiimote version has the add-on built in and will fit.
You can only play multiplayer on the Wii Fit Plus, not on the original Wii Fit.
Click on the cat/dog on the main Wii Fit Plus screen. Enter into their profile. Then go to the settings/options button and press delete.