Another lovely map
I know that you can get supplies for dogs, fish, gerbils, etc. at Homeplus, Emart, and other department stores, but their cat supplies are sorely lacking. There are two other small animal stores in Yeongtong, but last time I checked, they didn't have any cat supplies. I believe this is because cats are only recently becoming household pets due to being considered bad luck historically.
So if you have a cat like I do, finding a place that has cat litter and more than one type of cat food is a huge bonus.
Random picture of my kitty, Bessie
So I definitely recommend Plus Animal Clinic for your pet needs. I haven't taken Bessie to the vet here yet, but I've heard good things about them. You can also get the paperwork taken care of for traveling internationally with your pet - you just need to take your pet in at least one month before the travel date.
Some people just stop in to look at the cats. I'm not sure if the cats that are always in there belong to people or the clinic or what, but there are always at least 5 or 6 running around. When I stopped in today to get some cat food, it must've been kitty nap time because about 8 cats were sleeping all over the place.
And I mean all over the shop
So if you have a pet and need schtuff - carriers, toys, food, treats, etc. - I recommend stopping in and seeing if they have whatcha need.
Gratuitous picture of Bessie