I used to hate Mondays  like Garfield.
Me too, I loved reading the comic strips created by Jim Davis every day in the newspaper, Is that where you saw him at? 
Could you remember how the dog in Garfield was called?
Yea that was Odie, The really cute yellow-furred, brown-eared dog. I remember him. 
Yes he was really cute! and always so happy unlike Garfield.
"Garfield" is set in Muncie, Indiana the home of Jim Davis, according to the television special "Happy Birthday, Garfield". Common themes in the strip include Garfield's laziness, obsessive eating, coffee, and disdain of Mondays and diets. Garfield is also shown to manipulate people to get what he what he wants. The strip's focus is mostly on the interactions among Garfield, Jon, and Odie, but other recurring minor characters appear as well. Originally created with the intentions to "come up with
Odie
Odie is a fictional dog who appears in the comic strip "Garfield" by Jim Davis. He has also appeared in the animated television series "Garfield and Friends" and "The Garfield Show", two live-action/computer-animated feature films, and three fully CGI films.
Appearances.
Odie is a yellow-furred, brown-eared dog. In the live-action/animated films based on the "Garfield" franchise, he is depicted as a wire-haired dachshund/