just a total wild shot in the dark, but could it be the yellow bleeding heart? Most likely not, but who knows? :)

It looks like it could be Spanish Needles, Bidens bipinnata.

Yes, it is a weed, but if it's any consolation, those are the nicest looking Spanish needles I've ever seen!

Sorry.

Here is a link that might be useful: Google image results

Wow that is IT. It really is rather pretty in the foliage - and those flowers are exactly right, sortof lopsided puny feverfew.

Thank you so much!!

The seeds look like marigold seeds but can be a pain to remove from a dogs hair. I like the look of the plant but pull it when it starts to flower.

Whether it is a "weed" or not depends on whether it is a plant you want growing where you want it to grow. We have that growing in one planting bed and most everyone considered it a "weed" because it was not what they wanted growing there so it was dug out, again. I probably need to take one into our MSU Cooperative Extension Service office for ID one of these days.
I know some people in the area that allow it to grow as a ground cover.