What do you think this black lump is on my dogs leg?

My dog has a round black lump on his back leg. Do you think it could be a tumour or skin cancer? =(

Tumor possibly. I think a trip to the vet would be necessary.

the only way to know for certain is to have your vet look at it. even then, histopathologies are suggested to determine an exact diagnoses. best wishes.

My dog had the same i think. If it is quite hard then it is probably the same thing. It turned out that it was just a benign growth and it would have just got bigger but was not life threatening. Tak eyour dog to the vet and get it checked but don't start worrying until you know the results.