Side by Side Comparisons of Proportions.
These silhouettes are all computer-enhanced from actual photos of real animals. No animals are identified, they were chosen ONLY for the visual outline and not by name or bloodlines.
Heaviest build Draft horse,                      Medium build Draft horse         draft type Shetland pony.
When all are in the same scale, the Shetland pony falls in proportions with the Draft groups.
Cob                                           Modern American Show Draft              Arabian horse
The Cob is an all-purpose, light-draft/harness/hunter type horse.  The American Show draft has been bred to be taller and higher-stepping.  A Draft should be heavier boned than a cob, but in putting an ASD up next to both the Cob and the Arab, the Draft is almost equal in total bone to the Arabian. Trends for lighter bone are also in the Arabian horse as well, making them taller and leaner as well.  ONCE BONE IS LOST it is nearly impossible to breed back for it again.  It's easy to make a breed lighter, but if there is no heavy bone to go back to, it's lost for good.
Four Shetland-based breeds.  The American Show Shetland, British Drafty style, American Miniature Horse (double registered as a Shetland) and a British Shetland pony.  Four different body types.  The Show Shetland actually is more of Horse proportions (ie longer legs and smaller head) than the "Miniature" horse.  The fourth animal, the British Shetland, though drafty in type, has a very long back and is short-legged.
Stock Horse                                     Miniature Horse                               Arabian horse

While Stock Horse used to mean a rounded, muscled Quarter horse, again trends have created either animals that are so heavily muscled they resemble weigh-lifters, or so lean they are closer to a Thoroughbred in build.  In relative proportion, the Miniature horse in the middle of this group has a larger head and body than the horses on either side of him.  While this is normal in scaled-down horses, his head is not so overly large that it is completely out of scale to the rest of his body.
Medium weigh Draft                    American Miniature Horse             Thoroughbred

The Miniature horse (and most pony breeds) again shows the head proportion the be larger and heavier than those of a horse.   Donkeys have heads larger in comparison to  a horse.
Half-bred Poitou Donkey                             Heavy Draft-type Mammoth        Drafty Miniature Donkey

There are few gene pools of true "BREEDS" of donkeys in the USA, donkeys of various sizes appear in other types as well (ie, there are Standards and Large Standards in the pedigrees of donkeys of Mammoth stature, and there are also standards in the Miniature donkey gene pool.  This is why donkeys in the USA are categorized by height.  Until genetic markers can show that a Miniature is distinctly different from the other sizes/types, and all animals have recorded pedigrees, the ADMS will continue to register by type/height.  No breed can be kept pure and the book closed without proof of pedigree, as well as the animals breeding true to form and type.  It still occurs at both ends of the height spectrum, that small donkeys will have significatly larger offspring, and large donkeys may have much smaller offspring.
Mammoth donkeys (all over 56" in height) of various body types.  The heads are not necessarily  larger in proportion to the body than any other type of donkey.
In actuality, if the Mammoth is scaled so that wither height is the same as the drafty Mini, who has the larger head?
The original Miniature Donkey imports were heavy boned and drafty.  They should have proportions more like the draft-type animal and not the long, lean saddle animal.
Miniature Donkey                                  Standard Donkey                       Drafty Miniature Donkey

The leg bone has been bred away from on the miniature Donkey at left, to the point is has less bone than either the Standard donkey or the Drafty type (original type) Miniature.
Each of these animals are out of proportion.  Not just in length of forelegs, but the backs tend to get long, the croups (rumps) more shallow and weak.  Would you use any of these animals in your breeding herd?
Next Page - Foal Proportions versus Adult Proportions.
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Proportions of Equines
Side by Side Comparisons
Foal Versus Adult Proportion
MEASURING for Dwarfs
Romeo, Dwarf Donkey Case Study