Yes, you can use both at the same time.

All our prices is in US dollars so there won't be any difference on exchange rates. However some banks charge small fee for overseas transactions which we can't control. You can check with your credit card provider to avoid this.

Вся продукция соответствует установленным для нее срокам годности. В целом все товары произведены примерно 6 месяцев назад и имеют трехлетний срок годности, таким образом, в среднем у вас есть примерно два с половиной года до истечения срока годности.

You can opt out by clicking the "One time purchase" option. Even if you buy with auto refill option you can always cancel that anytime with no problem.

Heartgard uses the colors as a size label. So H. Blue is for small dogs, green for medium dogs, brown for large .. etc.