Somebody needs to number the cats in the image and then we can all play along. I can probably get more than half, but I'm too lazy to really think about it.
Yeah, it's Garfield. They look similar though. At first I thought Heathcliff was at the window, but I think it's Hobbes for Calvin & Hobbes. Heathcliff, along with a few others famous cat characters are missing (like Furball from Tiny Toons, Dr. Seuss's Cat in the Hat, and Hello Kitty).
^ Definitely Hobbes by the window. Looks like Snowballs I & II are there. No Fritz the cat either, but he's probably more obscure than most cartoon cats.
How about a game of missing cats? Catbert (Evil Director of Human Resources in the Dilbert comic strip) Snowball I (I see Snowball 2 in there) Hello Kitty. The Siamese cats from "Lady and the Tramp". And perhaps most damning, Isis from "Batman: The Animated Series" -- Catwoman's cat.
Here you go: 1. Cheshire Cat 2. 3. 4. 5. 6. 7. 8. Bill the Cat (Opus comic strip) 9. 10. 11. 12. 13. 14. 15. 16. Stimpy (from "Red & Stimpy") 17. 18. Garfield 19. 20. Sylvester the cat. 21. Simon's Cat (from the popular animated Youtube channel) 22. 23. 24. Nermal (from Garfield). 25. Snowball II (from "the Simpsons"; Snowball I was white) 26. Catwoman (duh)
Works fine for me. You don't have postimg.org blocked, do you? Here's a link to the page with the image: http://postimg.org/image/9azpchsqj/
5 & 25 both look like Snowball II. 7 is Felix, 13 is whatever the cat was from the Pepe LePew cartoons, 23 might be Tom.
22 is TopCat. Maybe we should be filling them in the list 23 looks like Tom about the time his appearance changed. plus there are pieces of (apparently) Jerry in front of him isn't 13 the female counterpart to Sylvester? (if there is one)