 9-7-8, can you ask the doctor if I should be concerned that I can feel my dog's spleen on the left-hand side when I feel just past the ribcage? There's a hard golf ball-sized lump. Well, I don't know that it's the spleen. I mean, that's kind of where the spleen is. So if you're going to feel the spleen, that's where you'll feel it. If it's under the skin but outside the dog's body wall, it's probably a lipoma.