Use a flat surface for even weight distribution and a clear view of the hooves.
Walk the horse in a straight line to get him/her into posing position. Handlers will often try to turn the horse in a circle to get into position which results in a curved back and awkward stand.
Use the angles and leg placement as demonstrated in the pictures above and below. The goal is to get the near side canons parallel in the vertical position with the off side canons pointing inwards towards each other.
The neck should rise upwards with head pointing forward and ears pricked
Keep the camera at the same height as the horse’s whither or just below.
Keep an eye on the tail which can easily slip across and obscure the nearside hock
Small light sources (the sun) cast deep contrast shadows so take your pics early morning or late afternoon with the sun shining directly onto the side of the horse and the camera in-between (sun at back of camera). This will illuminate all parts that are in shot and keep shadows off the horse. Pay attention to your own shadow in this regard too! Small light sources create desirable high contrast sheen/shine on the coat and enhance muscle definition.
Large light sources (overcast weather) cast no shadows so pics can be taken at any time of the day. Large light sources create low definition low contrast images without sheen. A flash is recommended to liven up the image and fill in darker areas underneath the horse (if he/she is standing on a dark surface with no light being reflected upwards).
With manual control of your camera settings, you can improve subject clarity whilst blurring the background at the same time – Google ‘Bokeh’ for the ‘how to’.
Aim for a nondescript background that doesn’t draw attention away from the horse with high contrast imagery.
Ensure that the background in shot is neat, clean and free from litter and/or other distractions