C-GWSV, a Boeing 737-800 aircraft operated by WestJet, was conducting flight WJA1233 from Fort Lauderdale/Hollywood Intl, FL (KFLL) to Toronto/Lester B. Pearson Intl, ON (CYYZ). During the climb through 10 800 feet after departure from KFLL, a rotary UAV passed to the right of the aircraft at approximately 100 feet above. The UAV appeared to have something hanging off of it. The flight crew notified ATC.