yes, there are many breeds of guinea pigs.
You can't ... you must have a boy and a girl. So ... buy another, borrow one from a friend, rent one. Your choice.
None of them are the best, but my favourite breed is the Himalayan.
No. There are of course crossbreeds, but there is only one 'breed' - Rottweiler.
normally they are the same but if your looking for a cheep one it woud have to be a short haired mixed breed one
Mop guinea pigs are not a separate breed but rather a descriptive term for long-haired guinea pigs with flowing coats. To get a mop guinea pig, look for guinea pigs with long, silky fur at reputable breeders or rescue shelters. Remember that grooming and maintenance for long-haired guinea pigs may require more attention.
Yes.
Yes because guinea pigs are very social animals. It is highly recommended to have more than one guinea pig!
There is not really a 'best' breed of guinea pig it really depends on what your looking for. Different breeds of guinea pigs don't affect the additude to much, but there can be slight changes such as long haired guineas pigs are not as athletic, and albino's don't like the sun.
You should sell your guinea pig depending on alot of different things.... Whether it is a registered guinea pig, what type of guinea pig it is such as the more expensive breeds like peruvian, calic, crown etc. Or if your guinea pig is more of the uasull type such as the American long hair or the American short hair. Some times the German short hairs are uasull types in some states. If your guinea pig is a registered breed then you cann sell him/her for more than 40$ depending on the breed, If your guinea pig is a more expensive breed like the ones i have showed you above you can sell them with out being registered for between 30 to 40$ , If your guinea pig is one of the most common breeds you can sell them for 20 to 30$ , But always make sure you are putting your guinea pig in a good home :)
Yes
Breed in the daycare with ditto
Yes he can. The males of the vast majority of animal species are genetically programmed to breed with more than one female - thus dispersing his genetic material.