Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to diagnose skin masses on dogs [title] Feel the skin mass. [step] Start by using clean hands to gently feel around the skin mass. The skin mass may be located on your dog's belly or trunk, though they can appear anywhere on your dog's body.

Ending1: If you cannot feel the entire mass, or it is located at the front of the mass's body, the mass is likely out of proportion to the dog's size and head. [substeps] Check for bumps on the skin mass itself. Ending2: Note if the skin mass feels soft and moveable under the skin. If this is the case, the skin mass may be a buildup of fatty tissue, known as a lipoma, which is not life threatening. Ending3: [substeps] If there are no bumps, smooth your hands over your dog's body. Skim gently from the stomach to just the bumps. Ending4: Feel underneath the dog's shoulders or under their ribcage. [substeps] The skin mass may also be located on your dog's arms, legs, or on its back.

Answer format: ending1/ending2/ending3/ending4