If you've spent any amount of time on social media today, you'd know that it's International Cat Day. On Twitter, the #internationalCatDay hashtag is trending, and it's full of lovely messages about felines, complete with tweets from celebs and cat lovers alike.

But we have data here at Thinknum Media. Lots of data. And some of us have cats. And cats love cat food. Lots of cat food. And kitty litter. And millions of people order their cat supplies online. So with that, what is it that we're buying for our cats the most, at least at Amazon and Walmart, two of the largest retailers in the world?

We took a look at the all-time best sellers at both of the massive retailers by digging into the "Pets" category at Walmart and the "Pet Supplies" category at Amazon. We then grouped by product name and then averaged out each product's average category rank since we've been tracking the data (about 2.5 years). It turns out that cat owners are doing a lot of shopping for cat littler online. It makes sense, being that cat litter is heavy, and having it delivered to your door for free turns out to be a pretty good deal.

Amazon's top-20 cat-related items

At Amazon, the top-20 cat products are led by cat littler. The Precious Cat Ultra Premium Clumping Litter in a massive 40-poung bag, to be precise. For just around $17, it seems thousands of Amazon shoppers are having the stuff delivered to their doors by the tons. Subscribers can find the complete dataset here.

Other top-sellers are Amazon include Fancy Feast Wet Cat Food, grooming gloves, flea collars, a catnip toy, and even a heated bed.

Name

Category Rank (Average)

Precious Cat Ultra Premium Clumping Cat Litter, 40 pound bag

1.42

[Upgrade Version] Pet Grooming Glove - Gentle Deshedding Brush Glove

2.00

Dr. Elsey's Cat Ultra Premium Clumping Cat Litter

2.15

K&H Thermo-Kitty Heated Cat Bed, 20-Inch, Sage

4.00

ScoopFree Litter Tray Refills - 3-Pack

7.26

Fancy Feast Wet Cat Food, Gravy Lovers, Poultry & Beef Variety Pack, 3-Ounce Can, Pack of 24

8.88

Dog Cat Pet deShedding Grooming Tools Trimmer Comb Brush,Keep Room Clean,Make hair more brightness

9.00

Bayer Advantage II for Large Cats Over 9 lbs, 6 Pack

9.33

PetSafe ScoopFree Self-Cleaning Cat Litter Box Tray Refills with Non Clumping Crystal Litter, 3-Pack

9.64

Purina Fancy Feast Wet Cat Food, Gravy Lovers, Poultry & Beef Variety Pack, 3-Ounce Can, Pack of 24

9.81

Purina Fancy Feast Gravy Lovers Gourmet Wet Cat Food - (24) 3 oz. Cans

11.03

KONG Softies Patchwork Bear Catnip Toy

11.50

Purina Fancy Feasts Grilled Seafood Collection Wet Cat Food Variety Pack (24) 3 oz. Cans

11.77

PetSafe Healthy Pet Water Station, Medium,  PFD17-11855

12.33

Purina Fancy Feast Grilled Gourmet Seafood Variety Pack Wet Cat Food

12.75

Greenies Grain Free Regular Size Dental Dog Treats, 36 oz. Pack (36 Treats)

13.00

Bayer Advantage II Flea Prevention for Large Cats, Over 9 lb, 6 doses

14.50

BOGZON Large Pet Dog & Cat Nail Clipper/Scissors with a Free File

15.33

Arm & Hammer Double Duty Litter, 40 Lbs

15.42

Pet Hair Remover Glove - Gentle Pet Grooming Glove Brush

16.31

Walmart's top-20 cat-related items

At Walmart (full list and dataset here for subscribers), the best-selling cat food is Friskies Prime Filets Variety Pack. At just around $11 for a 24-pack, it's no wonder that this one is flying off the real and virtual shelves at Walmart.

As for the rest of Walmart's top-20-selling cat supply items, a vast majority are litter-box related, including litter of all shapes and sizes and varieties. Another iteration of Friskies Wet Cat Food appears in the form of a 12 pack.

Name

Category Rank (Average)

Nestle Purina Pet Care Canned NP57800 8. 25 lb Friskies Prime Filets Variety Pack - Meaty Favorites

4.00

Special Kitty Fresh Scent Premium Clay Cat Litter, 25 Lb.

4.97

Special Kitty Fresh Scent Premium Clay Cat Litter, 25 Lb

4.99

Special Kitty Premium Cat Litter, 25 lbs

5.00

Special Kitty Fresh Scent Premium Clay Cat Litter, 25 lb capacity

5.00

Purina Tidy Cats 24/7 Performance Clumping Cat Litter - 35 lb. Pail

5.66

Purina Tidy Cats Clumping Cat Litter Instant Action for Multiple Cats 35 lb. Box

5.70

Purina Tidy Cats 24/7 Performance Multi-cat Clumping Cat Litter, 35 Lb.

5.81

Purina Tidy Cats 24/7 Performance Clumping Cat Litter, 35 Lb.

6.00

Nestle Purina Petcare Cat Litter IAC 35-Lb Scoop Pail For Multiple Cats Instant Action

6.00

Purina Tidy Cats Clumping Litter 24/7 Performance for Multiple Cats 35lb. Pail

6.00

Purina Tidy Cats 24/7 Performance Multi-cat Clumping Cat Litter, 20 Lb.

6.00

Ol' Roy Complete Nutrition Dog Food, 50 lb

6.19

Special Kitty: Natural Cat Litter, 25 Lb

6.67

Purina Tidy Cats 24/7 Performance Multi-cat Clumping Cat Litter, 40 Lb.

7.00

Tidy Cats Breeze Litter Supply, Refill Pads, Pack of 4

7.00

Purina Tidy Cats Glade Tough Odor Solutions Clear Springs Clumping Cat Litter - 20 lb. Jug

7.83

Friskies Wet Cat Food, Classic Pate Variety Pack, 5.5 oz Cans, Pack of 12

8.00

Purina Tidy Cats Glade Tough Odor Solutions Clear Springs Clumping Cat Litter, 20 Lb.

8.00

Purina Tidy Cats Glade Tough Odor Solutions Clear Springs Clumping Cat Litter, 14 Lb.

9.00