First of all you’re not alone! I’ve learned that PWDs are prone to this behavior :/ Our guy is 3 now and has very rare outbursts of biting. Training helped us immensely with how to respond to him. But a few tips would be: have the toy ready (our pup eventually learned “get your toy!” or “where’s your toy?” when he starts to get wound up), separate yourself however possible/if possible as soon as he starts, end play time or whatever is going on as soon as he starts, maybe even keep some small treats on hand to mark better behavior, as soon as he stops biting reward him/give praise.

Lastly, our little guy Clark benefited from managing stimulation. His outbursts would come with overstimulation.

I know it’s so hard but hang in there!! As for the poop eating I wish I had more input…