Within the past 2 weeks, I noticed our 10 year-old, spayed Tortie-calico-tuxedo, Miranda, has swollen mammary glands, bilateral, bottom 2 nipples. Fur sparse in swollen area. No noticeable lesions or inflammation, no drainage. Swollen area is squishy-soft, no palpable lumps, and Miranda shows no evidence of discomfort when swollen area is touched. No noticeable changes in behavior/personality. I've had Miranda since birth and she was spayed at 12 weeks old. Also noticed she has gained weight all over--probably a pound at least--after being thin & lanky most of her life, however she is not fat. Miranda is the oldest of our 7 cats. We changed food to Hill's prescription I/D dry formula about 6 months ago and all 7 of our cats have gained weight. ANYONE EVER SEE THIS IN A SENIOR FEMALE?