hard to tell from that picture, but he doesn't look thin to me.. You don't want him over weight and growing too fast. He will get to his adult weight and height growing slower. And will be a much healthier pup/adult because of it. I have had dogs that didn't get finished growing until they were over 3 years old. He does appear to be a finer boned dog..love him for who he is and when you have to lift him into a vehicle or on to the table at the vets, be thankful he is not 90lb, which is over standard size.. He's adorable.
dogbyte Cathy, Rossi ( the Dutch shepherd) and Gunny (the Czech/DDR GSD) with Zoey, Chance,Xara,Gracie, and Jaden snuggled deep within my heart