Mia has been spitting up a foamy substance ever since we got her. Sometimes it happened twice a day, sometimes once, and lately its going away. The interesting thing is that we used to free feed her, and stopped recently. So I doubt it is about food intake.
I asked the vet several times and they did numerous tests since we got Mia, but they don't know what it is, or what the cause is. The breeder was having this problem (with Mia and her sister) before we got Mia, and she had told us. She asked her vet and her vet didn't know what it was either. Both vets said not to worry about it, and to wait and see how things go. If it gets worse, and she is lethargic, not eating, etc. then its something to worry about. If she is eating and playful, the vets said its fine for now and not to worry.
I hope this helps.
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