This depends on where your horse is stabled at, what other horses he/she is in contact with, what the population density of the stable is, what worms have been a problem at this stable, how old your horse is and several other factors as well.
The best answer to this is to discuss your concern with your veterinarian when he/she does a routine physical, floats your horses teeth (files down the sharp edges) and/or vaccinates your horse. An adult horse stabled in a barn with relatively few other horses, a large amount of pasture space and doesn't travel anywhere may not need to be dewormed at all. In contrast, a young horse (less than 3 years old) who is stabled in a large barn with many other horses that rotate in and out, has very little pasture access and travels frequently to shows or competitions may need to be on a daily dewormer with additional deworming with a second drug every 2-3 months.
Your veterinarian can take a stool sample from your horse and look for the eggs of a parasite under a microscope; this is relatively easy to do and should cost less than $20. Based on what eggs are seen, your veterinarian can then recommend what dewormer you should use (there are at least three different drug classes of dewormers commercially availabe in the US) and how often you should deworm your horse.
3-4 times each year
The main thing a horse needs if frequently excercising is electrolytes these are vitamins and minerals that are needed because the horse is losing vitamins and minerals his/her body needs to be healthy.
electrolytes, (vitamins and minerals lost when the horse sweats).
I would recommend having your veterinarian conduct a fecal egg count test before deworming your horse, and then using deworming chemicals targeted at the specific species he or she finds. Horses naturally host parasites, and it is impossible to get rid of them all--in fact, some studies have shown that ridding a horse of all its internal parasites could even be detrimental. However, in large numbers, these parasites can cause various ailments, including frequent colic. If your veterinarian determines that your horse has a large parasite load, be cautious when worming, because encysted worms are resistant to deworming chemicals and can hatch in the millions after a heavily infected horse is dewormed, causing severe colic and even death. You should consult your veterinarian about your horse colicking, because it may be unrelated to parasites--perhaps you need to change your horse's diet or adjust other management practices. Do not deworm your horse during a colic episode or for a few days afterwards, as this could place unnecessary stress on an injured GI tract.
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Most foals don't need to be dewormed until they start eating grass on pasture; even then, provided the adult horses have been regularly dewormed there isn't much need for a foal to be dewormed. I would suggest not developing a standard program, but rather working with your veterinarian to address worming issues as needed in specific foals.
If the horse is in the stall frequently, then clean it frequently. Every day!
Food and care. And usually a horse will want to take a little rest.
Yes they need their shots and to be dewormed and at 12 weeks they need their rabies shot,any other medicine you need to ask your vet about.
every 3 months is a regular schedual, when you start you have to give them it twice. Once, then again in two weeks, after that its every 3 months.
they could be round worms....your puppy would need to be dewormed
Electrolytes