VannATLC said:
Shetland Ponies are marked as Medium? Really? I don't have my 3.5 books to look.
Shetland Ponies are not specifically listed in the
Monster Manuals. The Pony entry describes "a small horse, under 5 feet tall at the shoulder".
Shetland ponies are typically anywhere from 28 inches to 42 inches high at the shoulder. Remember, by 3.5 rules, a medium-sized creature is one that is 4-8ft. in height (or length), weighing 60-500 lbs. Most Shetlands will fall within that range, though some may be at the upper end.
By comparison, typical heights of large several large dog breeds (feasibly "riding dogs")...
Great Danes... 30 to 40 inches
Irish Wolfhounds... 33 to 36 inches
St. Bernards... 27 to 36 inches
Huskies... 23 to 28 inches
German Shepherds... 22 to 27 inches
An Irish Wolfhound...
A 3.5 halfling would be about as tall (34 to 38 inches) as that dog.