Hi how can I estimate how my gsd puppy will look like when it will be an adult?
Not really at that young of age, although you might get some clues as far as coat type (stock coat vs long coat) and some idea of coloring (although that can change significantly by adulthood).So the size and body type of a puppy of 1.5 months old may not say a lot about the future appearance as an adult
Not necessarily. In my experience the largest of a litter is often one of the larger dogs eventually but the smaller dog can land anywhere in between.From the same litter my puppy was a little bit more slim than other males. Does it affect its final size ?