I'm not a pet owner. A lifetime full of extreme allergies to nearly anything that moves eliminates it as an option. But I think the idea of a dog trying to communicate through the already truncated format of text messages is likely the funniest thing I'll see today.
Also, this pup appears to be British, which means there's a dog, thinking about these issues, in a British accent, then slowly punching the corresponding message with his paws. Got the image? Good.