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Welcome and thanks for asking your question. My name is***** am a licensed veterinarian. I am sorry for the delay in response. If you would like to continue can you please answer a few questions so that I can be well informed and give you the best advice.
1- Is she showing any other symptoms?
2- Are you 100% certain the gums in that are were pink before?
There may be a slight delay between your follow ups and my replies as I type out a thorough reply for you.
Friend, some dogs could have normal brown or black pigment in their gums; that would be normal for that dog. When we see discoloration this could be secondary to either a localized problem as in the case of certain type of tumors like melanoma. Or, even part of a systemic disease. Can chronic friction or irritation cause darkening? I have never seen this in the gums. But, in any case of chronic friction of the skin or membrane you can have inflammatory cells (macrophages) release melanin which is a chemical that will cause hyperpigmentation (darkening). So, could this have been caused by the chronic friction scratching as a result of fleas? Theoretically, I guess we can say yes. But, I have never seen that in clinical practice. For this reason, I would recommend a hands on examination with family veterinarian including a blood test to make sure everything is ok systemically.
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