My two year old cochin has an enormous lump on her underside. I first noticed it maybe 3 months ago, when she was molting. She never grew back the feathers, so I've been able to see it grow, and it's nearly double the size it was then. SHe can no longer use her left leg, and has to hop and flap to keep up with the other girls. Someone suggested that it was just a fat deposit, but it keeps growing. She is still laying eggs, but I'm worried about her quality of life. Should I put her down, or is she ok hopping on one leg? I dont know if she's in pain, but she seems mostly happy. I know when dogs have fatty tumors, they are pretty easy to remove, but I feel silly paying a few hundred dollars for surgery on a chicken. Any suggestions?