A. Licking and smacking of the lips are usually due to a GI problem, like nausea or pain in the gut. I don't typically think of mammary tumors as causing secondary GI problems, but I suppose unfortunately the possibility of metastasis must be considered and the GI tract could now be affected as well. I think your dog needs to see a vet who can do a thorough exam and try to put all of this together. And if you don't know already, tumors by the mammary glands in unspayed females are almost always malignant, and need to be removed ASAP.
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