Growth curves vary significantly by breed size. Toy breeds reach 80% of adult weight by 16 weeks; giant breeds may only be at 42% by the same age. The calculator interpolates linearly between known data points.
Jake just adopted Milo, a 12-week-old Border Collie mix (medium breed). Milo weighs 9 lbs at the vet. How big will he get?
Milo is predicted to reach about 16.7 lbs as an adult. Jake can use this to choose the right crate size now, plan food portions, and set expectations with the vet. Note that genetics and sex can shift the actual weight by 10-15%; females typically run slightly smaller.
Dr. Foster runs a small animal veterinary clinic in Colorado and specializes in puppy wellness and preventive care. She has reviewed this calculator to ensure the growth curve data reflects current veterinary standards.
For mixed-breed puppies, weight prediction is less reliable. Your best estimate comes from knowing the breed sizes of both parents. If unknown, ask your vet: foot size and bone structure offer additional clues.