My working cocker is 7 years old and I've found a lump on her flank, just behind her front leg.
It's really hard to feel when she's standing up, but if she lies down then it's very obvious - it's big enough to fill the palm of my hand!
She doesn't seem bothered by it but clearly I am. Vet visit is booked for Friday, but is there anyone with a clue as to what we might be dealing with.