There are many skin disorders and disease that can cause a dog's nose to become scaled or crusty. The crust may become very thick, flake off leaving exposed pink areas and even bleed a bit if the dog rubs at his nose and a piece falls off.
With this being said, let's first look at the most common reason for cracking or crusting:
Nasodigital Hyperkeratosis is the fancy, medical term for an idiopathic (which means that the cause is not known) condition that is manifests itself by the formulation of crust on the nose and/or paw pads.
This is not uncommon with brachycephalic breeds and therefore the Boxer breed is prone to this. This affects older, senior dogs most often, though dogs of any age
may develop this condition.
It should be noted that if you notice this type of issue on a young puppy that you are thinking of buying - the cause will most often be something more serious and it is recommended to refrain from purchase until you are able to obtain a legitimate clean bill of health from a reputable veterinarian.
The crusting on the nose may be light or thick, becomes worse without treatment and while crust may appear on any part of the nose such as around the nostrils, it most often will present as a thick crusting at the top ridge of the dog's nose.
Since the cause is not known this cannot be treated with any sort of prescribed medication such as antibiotics or the like.
However, in many cases when there is NOT an underlying health condition
and the ONLY problem is unknown crusting, the proper salve or cream will heal the Boxer's nose and restore it to its normal condition.
It is recommended to rule out underlying medical conditions before assuming that your Boxer has the common dry and crusty nose issue of Nasodigital Hyperkeratosis.
Once you know that your Boxer is perfectly healthy aside from the crusting issue, the right product can work amazing fast. Since this condition can quickly worsen without treatment, you will want to apply a quality salve as soon as possible.
Be careful to obtain one that is scent-free, as even the slightest of scents can be very off-putting for a Boxer puppy or dog which will lead to a resistance when you are applying it.
You'll also want to make sure that the nose balm is safe for ingestion since many Boxer's will lick their nose throughout the day.
The application should be done 3 to 4 times per day, preferably after each meal so that it is not wiped off while ingesting food. A good application in the morning and one at night is best, with 1 to 2 times during the day as well.
The right balm will add a layer of protection to the sensitive skin of the nose, softening crust so that it can naturally fall off without bleeding and allow the skin to heal and restore. Once you see results, it is a good idea to apply it to your Boxer's nose at least once per day to ward off any future problems with dryness.
If you are not sure which product will work best on your Boxer, you may wish to look to "Grooming" in the Boxer Dog Specialty Shoppe, which lists top rated products.