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Thank you for using Just Answer. My name is Rebecca; I am a veterinarian. Please give me a moment to type my answer.
I am sorry to hear you are worried about your puppy. She is only a month old, which means she is still nursing?
That is too young to be in heat. Your boyfriend is correct, the vulva swells up 3 to 4 times normal size when a female dog is in heat, and there is a bloody discharge, but it would not usually happen until at least 5 to 6 months of age, usually older. The vulva does swell and it is probably not a tumor. Is she really only a month old?
I have not heard back from you; I hope you were able to see my response. How is your Morkie doing?