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Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
The heart murmur can be related to the anemia, if the anemia is severe. It is important to figure out why she is anemic at this point - is she having blood loss somewhere (abdomen, digestive tract, etc) or is her body just not making new red blood cells (bone marrow affected) which would signal metastasis of cancer. IF not already done submitted the blood to the lab for a reticulocyte count and pathologist review of the CBC may help determine which of these is going on. IF she has good regeneration of RBCs then this may indicate loss somewhere that we need to find, and then finding that will improve her overall.
To your question, yes, you can supplement her with an iron supplement. But this is not as simple as sending you to the store to pick up a people supplement because dogs do not absorb all iron supplements equally. I recommend you get this from your veterinarian. (S)He was the type of iron that can help. This will probably not miraculously resolve her anemia but it can help her if her body decides it actually wants to make new RBCs. As well, if she is very low (PCV=20s or less) then a transfusion may be indicated to help her.
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