Can Garfield Talk?

Someone explain something to me. Can Garfield talk? To Jon, I mean. When I was growing up, I just assumed he’s not able to communicate, it’s just in his head. But then the other day I read Garfield for the first time in maybe a decade (no idea why) and it made it seem like Jon knows what Garfield is “saying”. Which is very odd. Especially since Garfield uses thought balloons. What, is Jon some sort of pet psychic?