Before you start actually using your
crate, your puppy will need to learn that it is a good place
to be. Many breeders begin the crate training before the
puppies leave, if this is the case with your puppy, still
follow the steps below, but expect to have a puppy who just
loves being in the crate very quickly.

Charlie (8 weeks old) in his
crateTake a tasty treat and / or toy. Lure
the puppy into the crate, praise and make a general big fuss
with the puppy while they are in the crate, give the treat,
have a little game with the toy and then allow the puppy to
come out of the crate. Do this 2 to 3 time in a row, several
times a day. Your puppy will soon be running into the crate of
his own accord, so you can now put a 'word' to the crate for
your puppy. 'Crate' 'Den' or 'Bed' are quite good words to
use.
Once your puppy is happy in their crate, close the
door and leave them in there for a couple of minutes. If you
do this when your puppy is tired in all they may even lay down
for a sleep when you close the door. Keep repeating this,
letting the time your puppy spends in the crate build up. If
the puppy cries ignore him. Only open the door when the puppy
is quiet and calm. If you do comfort the puppy or let him out
of the crate if he is letting his displeasure show, he will be
very quick to work out that this type of behaviour works to
get what he wants.
You will soon be able to extend the
time your puppy is in the crate. Many pups and adult dogs will
retreat to their crate (or 'den' to their way of thinking) if
they want some quiet time. The crate should be your pups own
personal space, just for them, somewhere quiet but where they
can still see what the rest of their pack (you and your
family) are doing.
Never leave a young pup or adult dog
in a crate for long periods of time unless absolutely
necessary. The crate is just a training aid and safe house for
your pup and should not become a total way of life. Young pups
should be crated or denned for their own safety when they can
not be supervised, but they need to come out frequently to go
to the toilet - even at night. See the article on
housetraining on how to manage calls of nature with your
puppy.
As your puppy get older and more sensible (this
is possible with a Boxer LOL), you will have to crate him less
and less. You may find that you go several days without using
your crate, but it is still a good idea to have your Boxer go
into his crate occasionally so he is happy with it when you do
need it. Many people leave the crates up all the time with the
door permanently open and their dogs can go in and out of them
as they please.
Crates are cruel. This statement is
very true for the poor dog who is crated for 23 hours out of
24, but like anything, if used properly they are a wonderful
tool. Dogs are natural denning animals - they like somewhere
comfortable and safe. If introduced to the crate properly they
love it. A dog accustomed to a crate will gladly run into it
when the command is given, and be happy to spend some time in
the crate. It is far crueller to leave a young puppy roam the
house or yard unsupervised, as they could get into many things
which could make them very ill or even cause their death. Far
better to have them safe and snug in a crate when they can not
be watched over.