I'm Dr. Jo and I'm here to help you with your question about Hugo. I'm so sorry he's having this problem, but glad you're looking for the information you need.
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Trying penicillin was a good first effort, but evidently it's not going to be enough to do the trick in the long run. There are a lot of different things that can cause the nose to crack on an otherwise healthy 3-year-old bully breed like Hugo, and most of them require more than penicillin for a permanent cure, unfortunately.
Some dogs get a really bad cracked nose from exposure to sunlight. This is especially common in dogs with white muzzles.
Other dogs develop a syndrome known as collie
nose (discoid lupus). You can learn more about it here...
Dogs who dig a lot can end up with a cracked nose from a fungal infection, and that won't stay heal until you treat it for several weeks with an antifungal medication.
And that's just a few of the things that can cause a cracked nose on a dog.
So the quickest, cheapest, and best way to get Hugo's nose back in shape will be to take him to a vet so you can find out exactly what the cause is. Then you won't have to guess at the treatment and will be able to get him started on the road to recovery as quickly as possible.
I hope this information helps to answer your question.
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