Everyone nests. Nests are generally rebuilt every two weeks or so, to clean the blankets, pillowcases, and nest covers. Scented items may be changed out more frequently, to keep the scent fresh/strong.
There are several different types of nests, with three being most common:
The classic, built on a frame (generally round) or the floor. They’re often surrounded by canopies.
Dens, which are more built somewhere more enclosed—such as a closet or modernized victorian box bed.
Perches, which are built somewhere raised—such as a loft/bunk bed or hammock.
The materials and set up of nests vary. Some prefer soft and blush, others more sturdy. Some want fuzzy, others silky, and others more linen/cotton. I've got a pinterest board with several examples.
(The stereotype is that alphas prefer dens, betas prefer perches, & omegas prefer a classic nest. This is reflected in media, & marketing for the various types.)
Each dynamic can be very territorial over their nest. Entering without first being invited is a good way to get yourself bitten.
Victims of abuse, or who lacked stable lives, may show a lack of interest in nesting, doing only the bare minimum. Others become even more territorial and defensive of their nests, not even allowing pack in. Still yet others may hide their nests. It can take time for their instincts to realize they’re safe.
Omegas become very fussy nesters during pre-heat. Their nest has to be just right, and this can cause frustration, sometimes to the point of tears.
If there’s space enough in the home, a pack will have a special pack nest they’ve built together. These are communal lounging spaces. Pups spend a lot of time there. If there isn’t space enough, the pack leader’s nest will double as the pack nest.
Pups tend to nest with their parents/guardians for the first two or three years of their lives. After that, they generally share a nest with other pups until around ten to twelve, when they develop a desire to have their own space.
If there aren’t enough pups for a pup nest, pups may stay longer with their parents or rotate between nests.
Older packmates may also choose to nest together, especially in times of stress… but also just because.
Pups usually build nests with their parents and/or siblings, to teach them how to do it on their own.
Pups moving into their own nest is something of a coming-of-age event. If funds are available, a big deal is made of picking out and setting up a frame (if applicable), and pack members will all gift pillows, stuffed toys, blankets, etc. Some will be new, others hand-me-downs. The pup then assembles their nest, usually alone, and shows it off. They usually have company the first night, though some want to prove they’re Big and sleep alone. There’s often a bit of an adjustment period, though, and they may end up regularly back in their childhood nests.
Nests play a large role in courting rituals. Gifting nesting material is a popular early step. Gifting scented nesting material is an indication of more serious partnership. Building a nest together is one of the final stages of courtship, as it declares an intent to bond.