Training, which is better than any device you can strap to your horse.
calpol
lubricating jelly
On the other hand,
State a purpose you would want something else for.
"Hi" or "Mr./Miss. Name" can be used instead of dear.
the world will find something else to use instead
A sharpie pen?
A sharpie pen?
I have a rig that gets pulled by two horses instead of one horse.
Horse blankets were made for horses, but like with everything else, you are able to use them for other things as well. Some people use them for picnics!
The answer to your question would be "horses". You would never say, "Did you see those horse?" Instead you would say, "Did you see those horses?"
Use exactly what the manufacture of your vehicle recommends and nothing else. To do otherwise is foolish.