Expert: Jessica - 12/21/2009

Question
I just had my five year old female cat spayed this summer.  Her last two breast have been swollen since then.  She is not in pain, eats fine and doesn't seem to be sick.

Answer
Hi Rose.  Any swelling in the mammary area should definitely be brought to the attention of your vet.  Thickening of the mammary tissue can indicate early changes associated with mammary cancer, and swelling can indicate an infection.  

If what you're noticing, however, is an accumulation of soft fat, this could be normal.  In some cats, the hormonal changes that occur as the result of a spay can cause weight gain, especially in the belly just in front of the hind legs.  This fat pouch tends to be very loose and jiggly, and some call it the "spay sway", as it swings when the cat walks.  Many cats with the spay sway are not overweight but simply have a belly flap, and this is of no concern.  

If your kitty has gained unhealthy weight, however, you should slowly cut back on her portions and try to increase her activity level.  Most cats gain healthy muscle and lose unhealthy fat when placed on a high-protein food.  Grain-free diets tend to fit the bill.  I feed my own cats Taste of the Wild (www.tasteofthewildpetfood.com).  But if she is significantly obese, you should talk to your vet about the best way to help her lose weight.  A prescription food may be necessary.

Best wishes!

Jessica