Miniature American Shepherd Puppy Weight Calculator

Calculate the adult weight for your Miniature American Shepherd. Just type your puppy’s current weight and age, and see how big your puppy gets.

Miniature American Shepherd Breed Profile & Growth Guide

Breed Overview

The Miniature American Shepherd (MAS) is a small-to-medium-sized herding breed that originated in the United States in the 1960s. Developed from smaller Australian Shepherds, the breed was officially recognized by the American Kennel Club (AKC) in 2015. Known for their intelligence, agility, and loyal disposition, MAS dogs are eager to please and highly trainable—making them excellent companions for active families and dog sports enthusiasts.

Size Category: Small to Medium
Miniature American Shepherds typically stand 13–18 inches tall and weigh 20–40 pounds at maturity. Due to their compact, athletic build, tracking growth is important to ensure puppies are developing at a healthy pace, particularly as rapid weight gain can impact joint and bone health in growing dogs.

Miniature American Shepherd Growth Chart & Weight Ranges

Age	Male Weight (lbs)	Female Weight (lbs)
4 weeks	3 – 4	2.5 – 4
8 weeks	5 – 8	4 – 7
12 weeks	9 – 12	8 – 11
4 months	12 – 17	11 – 15
6 months	18 – 25	16 – 22
9 months	22 – 30	20 – 27
12 months	25 – 35	23 – 33
18 months	28 – 40	25 – 35

Gender Differences: Males typically weigh 5–10 pounds more than females and may be slightly taller.

How Much Bigger Will My Miniature American Shepherd Puppy Get?

Miniature American Shepherds grow rapidly in the first 6–8 months and typically reach their adult height by 9–12 months, though they may continue to fill out until 16–18 months.

• Most MAS puppies reach 50% of their adult weight by 4 months.
• By 6 months, many are 75–85% of their adult size.

Rule of Thumb:
To estimate adult weight, double their weight at 16 weeks (4 months).

Exception:
Unlike giant breeds, MAS dogs typically finish growing by 12–18 months.

For more information on breed standards, visit the Miniature American Shepherd Club of the USA or the AKC MAS page.

Miniature American Shepherd Growth Tips

Nutrition

• Feed a high-quality puppy food formulated for medium-sized breeds.
• Puppies should be fed 3–4 meals per day until 6 months old, then taper to 2 meals per day.
• Avoid overfeeding—keeping your puppy lean helps reduce the risk of orthopedic issues and obesity.

Exercise

• MAS puppies are energetic and benefit from structured play, short walks, and mental enrichment (e.g., puzzle toys).
• Avoid high-impact activities like jumping or long runs until after 12 months to protect growing joints.
• Early training and socialization are key to managing their natural herding instincts.

Health Watch

While generally healthy, some growth-related or genetic conditions to monitor include:

• Hip dysplasia
• Elbow dysplasia
• Progressive retinal atrophy (PRA)
• Collie eye anomaly
• MDR1 gene mutation (sensitivity to certain medications)

It’s wise to work with a breeder who performs genetic screening. Regular veterinary checkups will help catch any developmental issues early.