my dog has long hair. why is that?

Answers:
It depends on the breed of dog and the genes the dog is carrying. . Some have long hair and some have short hair just as some dogs develop a thick undercoat and others do not.

It's kind of like like some people have straight hair and some have naturally curly hair.

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his hair grows fast or you dont cut it often.

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What breed is it?

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depending on the breed, longhair could be its dominant gene which means that just about all of them will have long hair except for a few rare cases. If your dog is dominant for shorthair then (s)he has two recessive alleles causing it to have longhair.

Some breeds on the other hand just have a few differences. Like chihuahuas come in long and short hair.

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Same reason he has four legs. his DNA dictates his physical properties

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It depends on the breed. Some dogs are long haired and some are short haired.

Long hair dogs probably need a bit more grooming.

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it probably inherited it's long hair ,or it needs a hair cut.