Texas Bluebonnet

Lupine (Lupinus) toxicity is well documented in general veterinary and rangeland toxicology literature: quinolizidine alkaloids, concentrated especially in the seeds, are a recognized cause of livestock poisoning ("lupinosis") across the genus, and this species' own academic profile page explicitly extends the warning to animals, not just people. Not covered by ASPCA's own small-animal-focused database or by NC State Extension, likely because this is a Texas-region native outside their usual coverage area rather than because it's been specifically cleared. Treat all parts, and especially the seeds, as a hazard for pets.