
Before you begin taking hoof measurements, please ensure your horse has a fresh and accurate trim.
Simply follow the steps below to select the correct size. Sizing is imperative to a good fit.
We cannot exchange used boots.
Old Mac’s are available in 9 sizes (0-8) with each size increasing by 5mm (3/16 inch) in width and length. It is important to note Old Mac’s sizes are in no way comparable to metal shoes sizes.
The unique design feature of Old Mac’s allows for width and length adjustment and allows for natural hoof growth between trimming. Immediately after a proper trim, measure your horse’s hooves. Correct size selection and proper fitting is very important and will ensure maximum performance from Old Mac’s Multi-purpose Horse Boots.
™
Step 1 – Trimming
Before measuring, ensure your horse’s hooves have been correctly trimmed with all flare and excessive length removed. We also recommend that the edge of the hoof wall, where it meets the ground, be beveled (rolled) with a rasp. This removes the sharp edge of the hoof wall and prevents chipping and white line separation.

Step 2 – Hoof Length
Hoof Length Size Chart |
|
Old Macs Size |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
|
Hoof Length (metric) |
100 |
105 |
110 |
115 |
120 |
125 |
130 |
135 |
140 |
|
Hoof Length (imperial) |
3 15/16 |
4 1/8 |
4 5/16 |
4 1/2 |
4 11/16 |
4 7/8 |
5 1/16 |
5 1/4 |
5 7/16 |
Measure the LENGTH of your horse’s hoof from the toe to the buttress line of the heel (see photos). The buttress line is the end portion of the heel that contacts the ground. On the chart below, circle your horse's measurement. If the measurement falls in between sizes, circle the larger size. In most cases, this will be the correct boot size for your horse.
Step 3 - Hoof Width
Measure the WIDEST portion of your horse’s hoof (see photo). On the chart below, circle the measurement closest to your horse’s width. This will help you determine if the width of the foot is compatible with the boot shape. There are two circumstances where we do not recommend Old Mac'sTM
:
1) If the width measurement exceeds the length by more than one size
(an unusually short and wide foot) OR
2) If the length exceeds the width by more than four sizes
(a very long and narrow foot).
Hoof Width Size Chart |
|
Old Macs Size |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
|
Hoof Width (metric) |
110 |
115 |
120 |
125 |
130 |
135 |
140 |
145 |
150 |
|
Hoof Width (imperial) |
4 5/16 |
4 1/2 |
4 11/16 |
4 7/8 |
5 1/16 |
5 1/4 |
5 7/16 |
5 5/8 |
5 13/16 |
Important Size Notes:
-
It is common for the LENGTH measurement to exceed the WIDTH measurement by up to four sizes. If the width measurement exceeds the length by more than one size (an extremely short and wide foot) OR if the length exceeds the width by more than four sizes (a very long and narrow foot), we do not recommend Old Mac's.