Said It Here

Should I biopsy my dog's tumor if it might spread?

Taking a sample from a mass can disturb the tissue and risk spreading it, but without testing, there is no way to know what the lump is. Owners are left caught between avoiding potential spread and needing a definitive diagnosis to know if the lump is cancerous.

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

  1. 1
    Waiting and observing the pet
  2. 2
    Seeking advice and experiences from online communities
  3. 3
    seeking a second veterinary opinion
  4. 4
    getting lumps aspirated or tested
  5. 5
    scheduling spay surgery

In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.

r/cats5 people · October 2026

“Yeah I would most likely get a second opinion”source ↗

nikagnuj · r/cats · 23 upvotes

“The vet told me that taking a sample from the mass would disturb the tumor tissue and that there may be a risk of causing it to spread. But without testing it, we have no way of knowing exactly what it is.”source ↗

“I honestly do not know what to do.”source ↗

“Has anyone here been through something similar? Could you please give me some advice?”source ↗

Direct-Gas-8400 · r/cats · 12 upvotes

“PLEASE please get a second opinion. I lost my beautiful Nala just under 2 months ago after she developed masses like this”source ↗

acciochef · r/cats · 6 upvotes

“I am quite worried because there has not been any major change in the size of this particular lump despite the medication.”source ↗

“Could this potentially be a tumour or cancer, or does it sound more consistent with hormonal mammary gland enlargement?”source ↗

RaRaRaur · r/cats · 4 upvotes

“Get that aspirated at least. It looks like a mammary carcinoma.”source ↗

International_Elk321 · r/cats · 4 upvotes

Where this came up

People with this problem also raised