Pet carrier

Pet carriers are small portable boxes, crates, or cages used to transport small animals such as cats, lap dogs, miniature pigs, ferrets, chickens, guinea pigs, and so on, from one location to another.
The two main types are the front openers (these are generally tough plastic boxes with a metal door, such as dog crates) and top openers (these are generally more like cages with a hinged roof), although there are other types. A carrier usually has a handle on top, although some are easier to carry in one's arms rather than using the handle.
Styles.
There are different types and styles of pet carriers available, according to one's specific needs, such as for when traveling by airplane or car and for a pet's species, weight, and size. 
Time in the Crate.
Except for night-time and some exceptional circumstances you shouldn’t crate your dog longer than five hours and not very often.