My 7-month old toy poodle has recently started peeing copious amounts of liquid uncontrollably?

He is 7-months old and was a perfectly house-trained dog 2 days ago and now for the last 2 days he's been peeing uncontrollably. i know its uncontrolled because he always looks down between his legs in surprise and then looks up at me as if he knows he's done something wrong. He used to go all night and then some with holding his pee but now he can't seem to go 2 hours. I have no idea where all that pee is coming from, his pee puddles used to be pancake size puddle but now their like 2 dinner plate sizes large. I'm afraid he's not retaining any of his drinking water. What is going on with my dog? The first night he peed on my bed (also the pee isn't yellow its odorless and clear??) and last night he peed all over his crate and was covered in urine? The thing that worries me the most is that it doesn't even smell. Whats up with that? As I've been typing this he just drank all the water in his water bowl? And he's not touching his food? I'm taking him to a vet today but I want to get an idea of what is wrong with him in case the veterinary office (Were new to this town) tries to make him take unnecessary tests(happened before he was fine just getting used to new food and I paid $450 for unnecessary tests).