You would need to be more specific in order for this question to be answered properly. The basic needs of an active horse are forage (hay/grass), feed, (there are many types - check with your vet), many horses require vitamin and/or mineral supplements, fresh water available at all times, proper shelter from the extreme elements and adequate exercise. There are also many vaccinations that your horse would require for good health. There are lots of great horse magazines and books available that can help answer all of your questions. Most public libraries have a good section of horse care related books.
For Howrse : Give them anti-inflammatory medications In real life, you should first of all call the vet and he/she will give you intructions and medicine to give your horse to help him. Give the horse that medicine exactly the way the vet tells you to, and your horse will be just fine.
When mounting your horse in an active arena with other riders, you should: Ask somebody to hold your horse while you mount Use a mounting block
you should give it a food poisoning tabletthat should help
You can give her sport shoes for jogging if she is active.
You should pretend the other horses don't exist in the arena. Your horse should stay calm and collected. If your horse doesn't then it needs more ground work.
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Colic is an emergency and you should call a vet. The vet will give the horse medication to relieve the pain and pressure.
When you tie your horse to a post, you should: Tie a loose knot that will give if he spooks or runs
You'r vet should give them to you.
On howrse, the answer is: Ask somebody to hold your horse while you mount Use a mounting block
you will have to give the horse a lot of massages in the part of leg that is stiff and give the horse inflammatory tablets to and hopefully that should work x
Penicillin is not always the best drug to give to a horse, you should consult with your equine veterinarian to get an exact idea of what medicine should be used for the ear infection.