Use your leafblower.
Blower-or fan-driven ventilators have been used in veterinary medicine to ventilate large domestic species, 4 including one using an electric vacuum cleaner as the drive source. 5
A simple, effective ventilator, utilizing either an electric or gas-powered leaf blower as the drive source, was designed to be used as an emergency field ventilator during a giraffe anesthesia study. 2 This ventilator is made of commonly available parts, has a pop-off valve and pressure gauge to prevent over-inflation, an expiratory valve to provide post-expiratory end pressure (PEEP), and is relatively compact and easy to carry into the field.
A SIMPLE, UNIQUE FIELD VENTILATOR FOR... (PDF Download Available). Available from: https://www.researchgate.net/publication/303751988_A_SIMPLE_UNIQUE_FIELD_VENTILATOR_FOR_LARGE_UNGULATES_ANOTHER_USE_FOR_YOUR_LEAF_BLOWER [accessed Jun 14 2018].
From Improbable Research