Honestly I don't know what it could be, could be genetic or an accident she had
or who knows what. But especially since you don't know her history you should
really bring her in for a general check up and vaccines at least. Also, dogs have a high
tolerance for pain, so she may be uncomfortable or hurt even though it may not
seem that way. I think you said she had fleas as well? So she probably has
worms also. Just better safe than sorry, you know? I hope that she doesn't have
any serious issues and wish you both all the best.
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