Home Slickdeals Amazon.com: K9 Advantix II Flea and Tick Prevention for Extra-Large Dogs 1-Pack... Slickdeals Amazon.com: K9 Advantix II Flea and Tick Prevention for Extra-Large Dogs 1-Pack 4 Monthly Doses, Over 55 Pounds: Pet Supplies $12.95 By ARCOM - 9 May 2021 73 0 SHARE Facebook Twitter Go to the deal page: Amazon.com: K9 Advantix II Flea and Tick Prevention for Extra-Large Dogs 1-Pack 4 Monthly Doses, Over 55 Pounds: Pet Supplies $12.95