Guinea pigs make great pets and they very rarely bite. They are inexpensive and have lovable personalities. Guinea Pigs can live 8 to 10 years and are easy to house and feed. They also tend to be hardy little animals and don't contract diseases very easily.

   These are relatively small animals, though through selective breeding a variety of different strains of have been developed. Guinea pigs come in sizes ranging from pets as small as a rat up to pets as big as a small dog. They also come in a variety of colors and hair styles. 

   Seven breeds of Guinea Pig are officially acknowledged by the American Cavy Breeders Association along with defined color variations. These are discussed in more detail under the Guinea Pig descriptions section below.

 Background:
   Guinea pigs, more accurately called "cavies," are generally classed as rodents and originated in South America. They were domesticated between 9000 and 3000 B.C. by the Incas of Peru, and were used for their fur as well as used for food. English and Dutch slave traders took some of these guinea pigs to Guinea (thus the name "guinea") and then to Europe, where they became popular pets. Guinea pigs have a great ability to adapt to different climates, and are therefore found in low to high regions as well as both moist and dry climates.
   Domesticated guinea pigs are rounder and plumper than wild ones, and are bred to display many different fur types and colors. They are also used extensively in research laboratories to study heredity, one reason for this being that they can reproduce fairly quickly.

Description:
   Guinea pigs can vary in size anywhere from the size of a large rat to a small dog, with an average weight of approximately 2 pounds. If well taken care of they can live from 8 to 10 years.

There are seven different recognized breeds of guinea pigs:
   These are acknowledged by the American Cavy Breeders Association, with 3 of them (the English, Peruvian, and Abyssinian) being the most general and well-known:
     English short-haired: These are the most common, with fine, short, glossy hair. Because of their short hair, their coat requires little care.
     Peruvian long-haired: With long, soft hair, these guinea pigs take more time and dedication to care for since daily brushings are needed. These animals are often used for showing.
     Abyssinian rough-haired: These guinea pigs have swirls of hair that resemble cow-licks, called rosettes. Their hair is more rough and wiry. For showing, the more rosettes the animal has, the better.
     Silkie or Sheltie: As mutations of the Peruvian, these are also long-haired guinea pigs, only without hair growing over the eyes. Rather, they have long hair growing to etiher side of their face, like a mane.
     Teddy: These guinea pigs have short kinky hair that is similar to that of teddy bears.
     White Crested: These guinea pigs look like the English short-haired ones, with the exception of one single rosette on their foreheads. For showing, this rosette must be white with no other white on it's body.
     Satin: These also have a rosette on their forehead, with their main difference from the white crested being that they have a glossy satiny coat. The actual hair particles are smaller in diameter than in other breeds, which gives these pigs the satiny look.

There are several different color variations in guinea pigs:
      Agouti: Every hair has the bottom and the tip the same color, with the middle being a contrasting color. There are silver, golden, and cinnamon Agouti's.
     Self: Solid colored coats
     Himalayan: White body with a black nose, ears, and feet.
     Tortoise Shell: Patched dark and light brown colors. They also sometimes have white, with all the patches having distinct lines.
     Dutch: White body with brown or tan markings.
     Brindle:Dark and light tan
     Albino:Completely white coloring with pink eyes.
     Mixed:Any assortment of colors.

Environment:
   Housing your guinea pig is limited only by your imagination, ingenuity, and budget. Adequate housing is a major factor in the maintenance of a healthy pet. Important considerations include what it is constructed from, that it provides good ventilation, is easy to clean, and provides plenty of room. There is no single correct way to house your guinea pig as long as its well being is the most important criteria.
   Enclosure can be made of wire, stainless steel, durable plastic, or glass; wood is not as good being more difficult to clean and guinea pigs may destroy it by chewing. The size of the enclosure needs to allow for normal guinea pig activity, the more room the better. Some authors and sites recommend a minimum size of approximately 2 square feet of space but the trend is going up to a larger cage, over 7 square feet. Ideally pet guinea pigs will appreciate lots of room, the bigger the space the better!
   Use bedding materials that are clean, non-toxic, absorbent, relatively dust free, and easily replaced. Some available bedding's for the cage are wood shavings such as aspen and kiln-dried pine (not cedar), shredded paper or Carefresh (a recycled paper bedding), processed ground corn cob, and commercial pellets. Put in a cardboard house or logs for the guinea pig so that he has a place to go when he gets frightened or is tired.
   Keep the cage up on a sturdy stand or table away from cold damp areas, out of drafts, and away from direct sunlight. Guinea pigs have a sensitive nature and are more comfortable in a quiet spot away from noise and stress. Keep them in a place to keep where other animals can't get at them. Clean the cage thoroughly with hot water at least once a week.

Care and feeding:
   Guinea pigs are herbivores and thus need fruits, vegetables, and grains in their diet. Carbohydrates and fibres are the basis of their diet. They have a high Vitamin C and folic acid requirement and unlike most mammals, they cannot manufacture their own vitamin C. It must be provided in their diet. A good staple food is guinea pig pellets, found in pet stores, and provides all these essential nutrients. Rabbit pellets will not work as they are not equivalent in nutritive value.
    Even with the guinea pig pellet though, much of the necessary vitamin C is lost in a short amount of time. You should supplement their pellets with a vitamin C supplement either by offering a small piece of a chewable tablet or a small amount of liquid drops; alternatively a handful of kale, cabbage or other dark leafy greens high in ascorbic acid.
    Other additions to the guinea pig's diet should be made carefully. The majority of their diet should be pellets along with the Vitamin C supplements mentioned above. The balance of their diet includes the addition of fresh greens, timothy / grass hay, and small amounts of fruit. Some of these supplements can include such things as lettuce (no iceberg), carrots, apples, tomatoes, cilantro, parsley, endive, kale, cucumber, strawberries, and grapes. An excellent food for them is bell pepper (especially red bell pepper), because it is high in Vitamin C. Grass can also be given, but make sure it is pesticide or spray free.
   Always remove any non-eaten greens at the end of the day. Food should be put in heavy china or pottery dishes (making it harder for them to spill the contents) and should be thoroughly washed with hot water at least twice a week.   
   Also make sure that a constant water supply is available, as water is very important. Gravity-flow water bottles, which can also be found in pet stores, are a good idea.

Activities - Exercise and Play:
   Guinea pigs need plenty of exercise and they also love to play. You can let them outside or run around in the house for short periods of time under supervision. They love to explore and need about one hour of supervised 'floor time' every day. You can also place short ladders and blocks in their cage that they can climb on.
   Also, since they are nocturnal (active at night), guinea pigs require quiet rest periods during the day.

Social Behaviors:
   Guinea pigs are social creatures and will like to have a companion. Most get along fine together however there are some things to take into consideration. Females almost always get along, and you can usually keep as many of them together as you want. Males may also be fine together, especially if they are use to each other or grew up together. However, new males may occasionally fight if in the presence of a female, and the dominant (older) animals may also chew on the ears or hair of subordinate cagemates.
   Guinea pigs are great companions for children, and though it is okay to have only one as long as it is given a lot of attention, they will do best with another guinea pig companion. They should be kept away from other household pets unless they are well acquainted with each other.
   Though rabbits and guinea pigs may get along fine together, there are a some considerations regarding shared housing. Their dietary needs are very different and often one species can carry a virus that can be deadly another. Also, a kick from a hyper rabbit can harm or even kill a guinea pig, and sometimes a guinea pig will nuzzle the rabbit's fur creating bald spots.

Handling and Training:
   When picking up a guinea pig make sure not to only grab it by it's shoulders. Pick it up evenly with your hands supporting it's entire body, and be careful not to drop it.
   Guinea pigs can also be taught simple tricks. They can be taught to stand on their hind legs and eat from your fingers once they are comfortable taking food from your hand. Some guinea pigs can even be taught to use a litter box, if enough patience and time are used.

Breeding/Reproduction
   Breeding guinea pigs can have complications with the foremost being that a female needs to be bred between 4 and 7 months of age, if she is to be bred at all, while the pelvic bones are only partially fused. An unbarred female that is older than this can have a very difficult time giving birth, due to the pelvic bones fusing. If breeding the female is delayed until she is older than this, she will require a caesarean section for delivery of the young. Also, a female often goes into 'heat' within a few hours after giving birth, known as 'postpartum estrous'. If she is with a male, she can end up nursing one litter while being pregnant with another. This is very stressful and dangerous for the female. A female's first litter is very small. A certain percentage of females die giving birth, abortions and stillbirths are not uncommon with guinea pigs, and females are not overly maternal in caring for their young. They do not build nests and will sometimes even remain sitting while nursing the young.
   Females are sexually mature between 4 and 6 weeks old, but shouldn't be bred until they are a at least 3 months old. Males are sexually mature at about 6 to 7 weeks of age but should be 4 months old before breeding. When breeding, you can either have a pair of guinea pigs or you can put one male in with several females.They can produce about 4 litters a year until they are 6 years old, but they shouldn't be bred that long.
   The gestation period for females is 63-70 days and they have from 1 to 6 offspring, with the average being 3 or 4. Babies are well developed at birth (eyes open, fully furred, and have teeth), and can run around a few hours after being born. In a few days they can eat solids, but should continue to nurse until about 3 weeks old, at which time they are weaned.
   If the mother dies then there are milk substitutes that are available to use when hand nursing the babies which you can give them with an eyedropper. Don't force the milk into their mouths - they have a natural tendency to suck and will suck at the eyedropper. They should be fed every 2 hours, and at least once through the night until they are weaned.

Common health problems:
   Guinea pigs are hardy animals and rarely get sick. However, if not taken care of properly they can become ill. Most ailments are preventable simply from taking proper care of the animal.
   Signs that the animal is not feeling well include: listlessness, huddling in a corner, a dull matted coat, refusing food, labored breathing, runny noise, watery eyes, and constipation. In most cases, there are medications available at pet stores which can be used to aid in treating the animal. In other cases a trip to a veterinarian may be required.
      Upper Respiratory Infections - The indications that your guinea
pig has a URI or even pneumonia are weight loss, runny eyes and nose, coughing, sneezing, and labored breathing. Respiratory diseases are generally caused from being in drafts and/or damp bedding. Make sure he is taken out of drafts and the cage is completely clean and dry, and place a dry cloth over the cage.
   Occasionally, middle or inner ear infections accompany respiratory disease, additional symptom in these cases include lack of coordination, torticollis (twisting of the neck) circling to one side and rolling.
     Pneumonia- Pneumonia is one of the most common bacterial diseases of the pet guinea pig. Many of the disease causing organisms inhabit the respriatory tracts and conditions of stress, inadequate diet, and improper husbandry will often predispose a pet to this ailment. Symptoms may include difficulty breathing, discharge from the nose and eyes, lethargy, and loss of appetite. In some cases, sudden death will occur without any of these signs. 
    Diarrhea: If your guinea pig has watery droppings and appears to have diarrhea, then the cause is most likely from having too many fresh greens, fruits, or iceburg lettuce. The simple remedy to this is to remove them completely and not feed them at all for a few days until he appears to be getting better. Then slowly re-introduce greens by giving them every few days. A fecal float done by your vet will determine whether your guinea pig's diarrhea is caused by parasites.
     Scurvy: If you notice that your guinea pig seems in pain, is losing a little weight and has a general loss of condition, it may be scurvy. This is caused from a deficiency in Vitamin C. Feed your pet more fruits and vegetables especially those high in Vitamin C. There are also liquid vitamins you can add to the water, but they loose their effectiveness rather quickly and make the water taste bad. Other symptoms of scurvy are swollen painful joints and ribs, reluctance to move, poor bone and teeth development, spontaneous bleeding especially from the gums, into joints and in muscle, if left untreated this disease can be fatal.
     Constipation: If it appears that your guinea pig is constipated, then it is most likely either not getting enough greens or water, so check both of those. Feeding a little romaine lettuce dipped in mineral oil, can help the relieve the condition.
    Lice and Mites:If your guinea pig is constantly scratching, it could be a sign that it has either lice or mites, which are parasites that live on the skin. A skin scraping by your veterinarian may be necessary to diagnose this problem. The only way to treat this is Ivermectin or Selemectin. Follow your vets orders.
     Fleas and ticks:Fleas and ticks are bigger than lice and mites, but cause the same scratching and discomfort as lice and mites. Completely clean and disinfect the cage. The best way to naturally control fleas is as simple as a flea comb, hot soapy water, and a good vacuum cleaner. A home remedy used for dogs and cats is to season their food with brewer's yeast and garlic, a natural flea repellant. Medication designed for cats can is often suggested for use, but a cat treatment flea dip can be harmful. Flea products are known to have caused deaths and illness in pets, so despite strong warning labels, we are hesitant to recommend them.
      Ringworm:Ringworm is a fungus infection on the skin. It is best to go to a veterinarian for this.
     Coccidiosis: Signs of this disease include diarrhea, loss of appetite, and listlessness. It is a protozoan parasite and is spread from contaminated food. The feces also carry it, so the guinea pig can be re-infected through it's own droppings. Make sure the cage is thoroughly cleaned everyday to reduce the chances of this happening. Take the guinea pig to the veterinarian in order to obtain effective medication. A fecal analysis is the only way to correctly diagnose coccidiosis.

Heat Stress   - Guinea Pigs are very susceptible to heat stroke particularly
those that are overweight/and or heavy furred, inadequate shade and
ventilation contribute. Signs of heat stroke include panting, slobbering,
weakness, reluctance to move, convulsions and ultimately, death. 

          Availability/Purchasing your Guinea Pig:
   Guinea Pigs come in many varieties and are readily available at pet stores, shelters, and rescues.
   When looking to acquire a pet guinea pig make sure it is a healthy animal. A healthy guinea pig will have brilliant eyes, good sound teeth, and a healthy coat. Any age and either sex will make a good pet, however you should plan to get more than one as they are very social and do best with a companion. Get a same sex pair or you could end up  having babies.