A dog tumour such as mast cell tumours looks like benign appearing lumps and ulcerated lumps with a stalk in the skin. This type of tumour is assumed to be locally invasive and it is very challenging to treat, because of how fast it spreads.
2 Additional Answers
Tumours such as mast cells tumours look like raised lumps and feel soft or like a lipoma which is a benign fatty lump. They can appear singly or in groups on the skin of dogs. The tumours are however not visible and they are only detected when pain or weight loss are investigated.
A tumour on a dog looks like benign, which is a tumour that lacks the ability to metastasize. A tumour is a solid or fluid-filled (cystic) lesion that may or may not be formed by an abnormal growth of neoplastic cells.