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Miniature American Shepherd full grown

A full grown Mini Aussie weighs 20 to 40 pounds. Males stand 14 to 18 inches at the shoulder and females 13 to 17 inches. The breed's official AKC name is the Miniature American Shepherd, and it is a recognized breed in its own right rather than a small Australian Shepherd.

full grown, across every size
20 to 40 lbfull grown, across every size
at the shoulder
13 to 18 inat the shoulder
before growth slows to a crawl
10 monthsbefore growth slows to a crawl

Miniature American Shepherd weight calculator

Answers update as you move the sliders.

Age unit
Weight unit
Expected adult size

Medium: 20 to 33 lb as an adult.

SexOptional

Likely adult weight

30lb

8 in 10 land between
24 to 40 lb
Fully grown
around 10 months

Size class: Medium, 20 to 33 lb

2Now4681012Adult
Age in monthsSo farProjected

Fair. Four to five months is the usual time to make this estimate. It is reasonable now, but the range is still wide.

Estimate only. For health questions, ask your vet. Mixed breeds can land outside the range.

See the expected weight month by month
AgeLikely weightRange
2 months7 lb3.7 to 12.7 lb
3 months10.7 lb6.1 to 18.5 lb
4 months14.8 lb8.9 to 25 lb
5 months18.3 lb11.3 to 30 lb
6 months21 lb13.4 to 34 lb
7 months23 lb14.9 to 37 lb
8 months25 lb16.3 to 39 lb
9 months26 lb17.1 to 40 lb
10 months27 lb17.5 to 40 lb
11 months27 lb18.1 to 41 lb
12 months27 lb18.3 to 42 lb
13 months28 lb18.9 to 42 lb
14 months28 lb19.4 to 42 lb
15 months29 lb19.7 to 42 lb
16 months29 lb20 to 42 lb
17 months29 lb20 to 42 lb
18 months30 lb22 to 42 lb

Scroll the table sideways to see every column.

Expected weight month by month, from the same estimate.

In short

Key takeaways

  1. A full grown Miniature American Shepherd weighs 20 to 40 lb across all its sizes.
  2. The weight and height here come from the official breed standard.
  3. Most of the growing is done by about 10 months.
  4. A double coat means regular paid grooming, which is a real yearly cost.
  5. The chart below shows a band, not a line, because individual dogs vary.

Adult size

Adult size and growth chart

Miniature American Shepherd

Medium size class · Category III (9 to under 15 kg)

Breed standard
adult weight
20 to 40 lbadult weight
height at the shoulder
13 to 18 inheight at the shoulder
most growing done by
10 monthsmost growing done by
WeightHeight at the shoulder
MaleNot stated14 to 18 in
FemaleNot stated13 to 17 in

Scroll the table sideways to see every column.

Miniature American Shepherd growth chart. Weight runs from about 5 to 9 pounds at 2 months, up to about 20 to 40 pounds at 18 months, for a full grown Miniature American Shepherd.
Estimated from the adult weight range above and the growth standard for the medium size class. The band runs from the low end of the adult range to the high end.
See the Miniature American Shepherd weight by age as a table
AgeLow endHigh end
2 months4.6 lb9.2 lb
3 months7 lb14.1 lb
4 months9.7 lb19.5 lb
5 months12.1 lb24.1 lb
6 months14 lb28 lb
7 months15.4 lb30.8 lb
8 months16.4 lb32.8 lb
9 months17.1 lb34.3 lb
10 months17.6 lb35.3 lb
11 months17.9 lb35.8 lb
12 months18.1 lb36.3 lb
15 months18.8 lb37.7 lb
18 months19.9 lb39.8 lb

Scroll the table sideways to see every column.

Timing

When a Miniature American Shepherd stops growing

In our figures, a dog in the medium size class has done almost all of its weight gain by about 10 months. After that the weekly gain drops below a quarter of a percent of adult weight, which is slow enough that you will not see it on the scales week to week.

Height finishes earlier than weight. The AKC puts small breeds at full size by 6 to 8 months, medium breeds at around 12 months, and giant breeds at 12 to 18 months, with some very large breeds taking up to 24.

10 months

before weekly weight gain drops below a quarter of a percent of adult weight

Sex

Male and female

The breed standard gives different figures for males and females, and they are in the tables above. In the growth data behind our calculator, a female of a given size class is also slightly further along toward her adult weight at any given age than a male, so telling the calculator which you have shifts the estimate by a few percent.

Variation

Why individual Miniature American Shepherds differ

A Mini Aussie is a separate AKC breed, not a small Australian Shepherd. The full-size Australian Shepherd standard is 18 to 23 inches and 40 to 65 pounds, several inches taller.

Twenty to 40 pounds is a wide band for a dog of this height. The breed standard sets height tightly and lets weight follow the frame.

Running cost

Grooming a Miniature American Shepherd

A double coat is a running cost, and it is worth knowing the figure before you take a puppy home rather than after. The price per groom goes up with the size of the dog.

Work out the cost

FAQ

Questions people ask

How big is a Miniature American Shepherd full grown?
20 to 40 pounds across every size this breed comes in, standing 13 to 18 inches at the shoulder. Those figures come from the breed standard.
How can I tell how big my Miniature American Shepherd puppy will get?
Weigh your puppy and enter its age in the calculator on this page. It is already set to the medium growth curve for this breed, so it works backwards from where your puppy is now rather than from the breed average. Four to six months is when the estimate is most reliable.
How often does a Miniature American Shepherd need grooming?
A double coat needs a groom every 4 to 8 weeks under published guidance. Over a year that adds up, and the grooming cost estimator works out what it comes to for a dog this size.
When does a Miniature American Shepherd stop growing?
Weight gain slows to almost nothing at around 10 months for a dog in the medium size class. Height finishes earlier than weight in every breed.
How big is a mini Aussie full grown?
20 to 40 pounds, at 14 to 18 inches for a male and 13 to 17 for a female. That is the AKC standard for the Miniature American Shepherd.
Is a mini Aussie the same as a toy Aussie?
No. The AKC recognizes the Miniature American Shepherd and nothing smaller. A dog sold as a toy Aussie is below the standard, and there is no registry variety for it.
When does a mini Aussie stop growing?
Around ten months for weight. Our figures put the medium size class at about 88 percent of adult weight at ten months, with the rest arriving slowly.

Method

How we calculate this

The adult weight and height come from the sources below. The shape of the growth chart comes from our own calculation on the open data behind a published veterinary growth standard, described on the how we calculate page. The charts are estimates built from a breed range and a population curve, not measurements of this breed.

Sources

5 sources behind the figures on this page.

  • Miniature American Shepherd breed standard

    American Kennel Club - read 2026-10-08

    akc.org

  • Australian Shepherd breed standard

    American Kennel Club - read 2026-10-08

    akc.org

  • Growth standard charts for monitoring bodyweight in dogs of different sizes

    Salt C, Morris PJ, German AJ, Wilson D, Lund EM, Cole TJ, Butterwick RF. PLoS ONE 12(9):e0182064 - dated 2017-09-06 - read 2026-10-08

    Open access. Sets the adult-size categories and the growth standard method.

    pmc.ncbi.nlm.nih.gov

  • Growth standard charts for monitoring bodyweight in dogs of different sizes - supporting data

    University of Liverpool Data Catalogue - dated 2017-07-28 - read 2026-10-08

    14,957,947 weight records from Banfield Pet Hospitals, 1994-2013, released under CC BY 4.0. Our growth curves are calculated from this file.

    datacat.liverpool.ac.uk

  • When Does My Puppy Finish Growing?

    American Kennel Club - read 2026-10-08

    akc.org

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Last reviewed . Estimate only. For health questions, ask your vet.