If the coupon code that you have entered is not working, please first check that the coupon code has been entered correctly. Second, you should make sure that the coupon is still valid and has not gone past it's expiry date. Third, you should re-read the conditions to make sure that your order qualifies for the coupon discount. For example, some coupons are set up to allow for only one use per customer, so on the second attempt the code would not be accepted. If the coupon code you are using is valid but you still cannot get it to work, then you should contact us at info@canadavet.com.