Is my poodle underweight?

So before I'm asked to go ask his vets, I'm in a rural area, and the vet is a good hour away. Car sick puppy on my hands. He's a Standard Poodle. He's 17 weeks and stands 18 inches at the withers. He weighs 8.2kg. He was malnourished when I got him. He's since had a massive growth spurt. What is he classed as? He doesn't feel skinny at all anymore.