Whining in crates is normal for puppies. It can be due to unfamiliarity with confinement or feelings of isolation and loneliness.
Ignoring the whining is the best option. Giving attention or taking the puppy out of the crate when whining can reinforce the behavior.
The crate should be large enough for the puppy to stand up, turn around, and play with toys. Consider crates with dividers for adjusting the size as your puppy grows.
Familiarize your puppy with the crate. Provide treats, chew toys, and bedding to make the crate a comfortable and happy space.
Puppies need frequent potty breaks. The number of hours a puppy can hold it is roughly their age in months plus one.
The crate should be in an area where the family spends a lot of time. This helps the puppy feel less isolated and allows you to hear when they need to go outside.
Ensure your puppy gets plenty of exercise and attention outside of the crate. This can help them be ready for a nap when crated and reduce whining.