Ground bison – what to season it with?

I’d go with what you did and add a little cayenne. If it’s extra lean, I would start with a 2 tablespoons of bacon grease per pound of meat.
If I wanted a southwest flavor, I’d choose a home mixed taco seasoning.
In either case, I would brown the meat over medium high heat. The “dog shite” taste is either from meat that wasn’t sufficiently browned or it’s rotten.

Bison is pretty lean meat and has a dearth of requisite fat to give the taste that we are accustomed to with ground meat. On the rare occasions that I do get bison, I cut it with either ground pork or I get a pack of raw green onion sausage along with salt, pepper, garlic powder and onion powder.

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Never had ground bison that tasted bad. Have made many bison burgers with only s&p plus whatever basic burger condiments.

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I agree, I’ve never had bad ground bison.

OP might’ve got a batch of spoiled meat.