I just got another GSP a couple of months ago. I have two now from different breeders. Physically they have some obvious differences. They are both good tempered, birdy and should be good bird dogs. Not questioning the quality of breeding, just asking for some input. The new dog (6months) has much larger "houndier" ears and she is much bulkier than my 13month old. The 13month ive been feeding about 4cups a day and cant put wweight on her - I would compare her build to a greyhoung type almost, and her ears are much smaller. I get them out a few days a week but we dont hunt all day or anything. Breeder said it could take 3years to fill out. Just seems odd that being the same breed these two traits would be so different. Are these certain bloodlines and what could this mean down the road?