If the puppy is growing out fur, for up to 3 weeks, this is normal, some dog breeds need different coat growth times.
There are supplements to improve the dog's hair and others that guarantee a general improvement for the health of your companion. Vitamin complexes and essential fatty acids are the most common and recommended. Always look for a veterinarian to indicate the best supplement for your case.
With this information, we can conclude that if the puppy is letting its fur grow, for up to 3 weeks, this is normal, some dog breeds need different coat growth times.
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