● Costco has Frontline and frontline plus. But it is only available in US Costco
● You can find it at the Pet food/toy aisle if you go to US Costco.
● Another option is to buy online (usually shipped from Austria). It has more choices (Revolution, Frontline, etc). Google 'vetshopmax". When I bought Revolution there, I received some deworm (maybe Drontal) for free.
● 我也以为是这样，但是。 It's Official: Your Dog Knows Your Face!
The overall results of their study indicate that dogs -- like humans and primates -- are indeed capable of facial recognition.