A lot of it sounds like dominance and insecurity issue to me. You need to establish yourself as the dominant one (the pack leader in dog terms), so he understands that YOU are the boss. As for the biting...dominance maybe? But, a soft muzzle is an easy fix in the meantime. The peeing in the house thing. Well, he's older and it may be that he can't hold it as well. Is it a new thing? Do dogs have prostates? Possibly incontinence (which is common in older dogs).
ETA: Rereading what I wrote, I think it comes across kinda short.
I didn't mean it that way at all.
I honestly meant it in a helpful sort of way...I had a similar problem with DHs dog when I first moved in. She thought she was the boss of me...not so! It's all better now though.
ETA: Rereading what I wrote, I think it comes across kinda short.


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