“…The dose of 20 mg of doxycycline/kg represents the cumulative dose for 2 days of treatment according to the recommended dosage of 5 mg of doxycycline/ kg twice a day. 1,[8][9][10] For each experiment, the time of drug administration was designated as 0 hours. A blood sample (3 mL) was obtained by venipuncture from each dog at 1, 2, 4, 8, 12, 24, 36, 48, 60, 72, 96, and 120 hours after drug administration.…”