This will be a bit tricky ... but should be do'able.
Solvents like mineral spirits, acetone or lacquer thinner will have little impact on latex paint. Especially the acrylic types (which I suspect this is).
I would use a product called Citrus Strip, it is user friendly (no harmful chemicals) and works well. It is available in both a gel and an aerosol at Wallyworld and either Lowes or Home Depot.
While the concrete is still cool (as in early am) apply it thickly and cover with plastic (this will keep it from drying out and remain active) and let it work for 45 mins to an hour. Then wipe it us and see were you are. If need be, you can reapply and scrub with a stiff bristle brush. Keep working it and I am sure you can get it up. Do not be afraid to reapply, cover, let it work and scrub more.
Good luck and btw ... how deep did you bury the cat? ;-)
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