How many metastases can you see in this x-ray image?

Hi, I have a female dog, but I dont' know her age because I found her in 2016. She's a beautiful Pincher toy and is probably 12/13 years old. She's not spayed and now has a large a big mammary tumor. This summer my parents and I had Covid 19 and after my dog began having respiratory crisis. We saw a veterinarian who prescribed antibiotics, then another one who suggested a daily pill to treat heart disease. A little and soft chest lump has got bigger and bigger since September and now it's huge and purple. The two veterinarians confused this nodule for a fatty tumor. I decided to operate her, but I changed my mind when I saw pre-operative exams. Here is the x ray showing her lungs. How many metastases can you see? The veterinarian told me she has something that affects her respiratory system, but she cannot recognize what it is. Unfortunately she is no longer operable, even if the vet wanted to do it.

Sorry, I posted the wrong picture. This is the right one.

Hello- Are you a qualified vet?  I am going to assume that you are the client and someone else - your vet - operated on your dog to remove the nodule, but if I've got that wrong please let me know!

Sorry, didn't operate because they saw the lung radiograph.  I see now.

It is your vets' responsibility to interpret radiographs, in light of what they can see and hear on the patient in front of them.  I have only had the examination findings from an owner's perspective, not a vets' one. Furthermore, I don't comment on another vets' radiographs unasked - if your vet wants a second opinion, we would advise that they seek the advice of a specialist.  Your asking a random online GP vet is unhelpful, because you know nothing about my experience level relative to your own vet's.  If we don't both think the same, who should you beleive?  I can only muddy the waters.  Most chests are radiographed and evaluated from two directions:  top to bottom and side on; the combination gives the clearer picture.  Only one direction is pictured here (this may be because the patient wouldn't sit for the second).  Where did the other lateral chest x-ray on your phone come from?  - it seems unusual to have another lateral radiograph of a dogs' chest on your phone?

Chest radiographs in general highlight things of soft tissue density within the chest.  This includes things like the heart, some aspects of the lungs, the walls of tubes / airways etc.   If something unusual is seen, its outline / distribution within the chest and rough radiographic density can be noted.   However, since cancer mets and lungs infected by eg fungus are of the same density, a radiograph won't distingish very easily between the two.  The vets will then look for other clues, such as the context, or may decide to trial-treat eg against infection. I think that you probably need to speak with your vets about the findings in context of the case they are dealing with and take it from there.