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Yorkshire terrier mammary glands tumors!

Good day to You!
We have Yorkshire terrier Pixie, female, 6 y.o., no inflammatory or other diseases in anamnesis, intact. 1,5 week ago we found two small (up to 0,5 cm in diameter) lumps in her left and right mammary glands (last pair).
Today we consulted our veterinary – the inspection showed two small tumors with no involvement of regional lymphatic nodules (palpatory).  Last heat was 1 month ago. It was proposed to us to undergo bilateral mammary gland ectomy. Blood test and biochemistry showed no abnormalities. BUT the X-Ray examination showed small (circa 1 mm) lesions in the roots of the lungs. Also there is enlargement of the heart. Our animal doctor said that it can be metastasis or result of some inflammatory process like pneumonia. He prompted to perform X-ray examination in 3 month and see it Mts or no, and the operation was canceled.
The dog is in great condition – no symptoms of disease or Mts (we are both medics with wife).
Also today we consulted X-ray doctor from Radiology department in human hospital (he is an experienced professional) and he said that there are no any signs of Mts, all vessels are clean and only right heart chambers are enlarged.
Is it a right tactics and should we worry about X-ray results?
Here  we add links to X-ray images.

Thank You!
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2054217 tn?1330542034
Sorry to hear about your dogs case. While I 100% respect the opinion of human doctors, especially radiology specialists, it is possible that the differences between human and canine physiology makes his judgement a little less sound. Regardless of that you cannot wait 3 months to see what happens with the radiographs. The tumors must be removed and done so as soon as possible. Mammary carcinomas are very serious and very prone to metastasize and like cancer seen in people, early diagnosis and treatment is imperative for a good prognosis. Imagine this scenario: The lesions in the lungs are not a concern but 3 months from now the lungs are filled with mets. If that happens then you have lost any chance at all in saving your dog. Get the surgery done and get her spayed as well. And in the future have your dogs spayed well before 12 months old.
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