Unfortunately I found a little red rash on my 3 year old black lab 2 weeks ago and then on Friday I noticed it had turned into a raised lump. I took her straight to the vet and they did a biopsy which confirmed it is a mast cell tumour. She had an operation yesterday to remove the lump and we are now waiting for the pathology/grade. I am super worried because I hear young dogs and Labrador retrievers tend to have more aggressive cancer than other breeds. I also hear grade 3 is not curable. I am hoping it's not and she gets through this. The wait of 2-3 days for the results is agony.