Clematis tangutica, Clematis ligusticifolia, Clematis terniflora, all have similar looking seed heads. USDA says none are present in MI, but BONAP mapping does seem to show Clematis terniflora present in MI so I am going to go with that one for now and see if I can find it again this spring/summer and maybe confirm when leaves and flowers are showing, Thanks for all the leads and assistance.

The seed heads are commonly called foxtails, and the grasses are abundant in Southern California (Ed lists So. Cal by his name). Some species, to various degrees, are dangerous for dogs, especially during the time when they are brown and firm. They can burrow through a dog's skin and cause serious infections and abscesses, and eventually even death. They get stuck in ears (perforated eardrum), nose (down into the lungs), between the toes, etc., especially with long-haired dogs. They work their way through skin and sometimes even enter organs. Once the foxtail penetrates, it does not break down. Veterinary assistance is usually necessary if the problem is not caught quickly, or if the foxtail is in a location where it cannot be easily removed. That is what I mean by vet bills.

Hordeum jubatum (Foxtail Barley), thanks! "While foxtail barley may be palatable for animals in early spring before it flowers, its seed heads, when dry, are very harmful to grazing animals. The awns with upward-pointing barbs become easily attached and embedded in the animal's mouth and face, causing severe irritation, abscesses, and even blindness. Foxtail barley is also host to a number of viruses, and because it harbours wheat rust and blackstem rust, can indirectly affect the development of field crops." Interesting, because those awns seemed pretty soft, not spiky...but I barely felt them, so who knows?

Is this the same plant as your other post: https://www.houzz.com/discussions/5912653/spreading-weed-plant-small-spiky-flower-head-help-id#n=2