Yes a female horse (mare) can be spayed. It's a bit costly due to the nature of the surgery that must be preformed, but it can be worth it. Many mares really should be spayed to prevent them being bred, especially those with poor conformation or cross bred horses that can't be registered.
No. Castration is the removal of the testes, or testicles. Mares (female horses) lack these organs, by definition.
Female horses could undergo a "tubal ligation," but there is little point in such surgery, which is generally conducted to permit the enjoyment of sexual activity without the risk of pregnancy. It is far easier and cheaper to simply keep studs (male horses) away from the mares. Also, brood mares are more valuable than sterile mares.
Castration has a calming effect on male horses, it prevents them from reacting to chemical stimuli (mares in heat). There is no such effect from sterilization of mares.
Yes, a mare can be spayed surgically, or you can artificially stop her cycles.
Spayed female cats are called just that - spayed, or fixed, female cats.
Not usually - a female goat would only get spayed if she had an issue with her uterus.
Spayed female cats and dogs do not menstruate.
Female rabbits can be spayed when they are about 6 to 7 months old.
Spaying is the removal of the ovaries from a female dog. No dog that is spayed can have puppies. No female dog can have puppies with another female dog. If you are asking about a male dog, the correct term is neutered, not spayed.
Females are spayed. Males are neutered. A spay is the removal of the uterus and overies from the female.
Spayed.
A female guinea pig is called a sow, whether it is spayed or not.
yes but its called spayed I'm not aware of any way for a female dog to be spayed chemically. It is a surgical procedure.
Unspayed females have shorter lifespans and tend to develop mammary cancer easier than a spayed female.
Female puppies get spayed. Male puppies get neutered.
It doesn't matter that much, it just depends on personal preference, whether or not they get along with each other and with other pets in the family, and if they are neutered/spayed. If they aren't neutered or spayed, you should be sure to get the same gender puppy if you do not want them to breed.