hello everyone I'm rather new and I have a question about my older dog's health. He's a 13 year old eskie named 'Wolfy'. He has had few health issues, and those he's had have been quickly taken care of. Lately though I've been feeling large flat lumps under his skin in his chest. I'm taking him to the vet soon, but does anyone have any idea what they might be or if I should be concerned? Thank you.