Normally, the ears.
It's really hard to tell what a horse is thinking, but they can use body language to tell you how they're feeling. If they are angry, or upset, or nervous.
Tell her and start feeling parts of her body.....
It means the horse is angry
You can tell how old a horse is by the grove on its last incisor's.
it has parts for you feeling and emotions
a horse has many behavior patterns it can have any feeling u as a person can have
this could mean a couple of things. if they are just turned around, he could just be resting them. if they are turned around but still upright, he would most likely be listening to something behind him, like his rider. If they are pressed flat against his neck, he is pretty mad. the best way to tell the difference is looking in their eye... you can tell a lot by the look in it.
If you mean 'how can you tell how old a horse is' The answer is, you can tell by their teeth. If you want to tell old a horse is, find a book about horses that gives you pictures of the different stages of their teeth. Match the horse's teeth up to what the picture says and you will know approximately how old that horse is.
from what i can tell, an unproportional horse or a horse that is badly trained. its usually not their fault.
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When a horse's ears are bent back, it can indicate that the horse is feeling defensive, apprehensive, or angry. This body language may suggest that the horse is feeling threatened or uncomfortable in a particular situation. It's important to be mindful of a horse's ear position as it can give insight into their emotional state.
To tell (or ask) your horse to trot is:"Aller au trotter."Translation is: To go into a trot.