I think the depression is definitely from bipolar disorder. Other things can trigger it or make it worse though. The depression can make anxiety worse, and bipolar depression is very hard to treat

Buddy's 10 and bit me for the first time a couple of months ago, but it had nothing to do with feeding. Dottie (9) has never bitten me, but Rocky (11) tries when I clip his nails, so I dread doing it. I think they've all bitten, or have tried to bite, my husband though. He doesn't seem to pick up on the signals they give off when they want to be left alone.