A borrower for use must use great care to preserve the thing lent in safety and good condition. If it is a living animal he must treat it kindly and provide all things necessary and suitable for it. He is bound to have and exercise such skill in the care of the thing lent as he causes the lender to believe he possesses and he must repair all deterioration or injury to the thing arising by his negligence.
SDCL 43-37-6