Potato

The tuber flesh itself (once cooked, without green portions) is the food crop and not a hazard. The risk is the green parts: foliage, stems, sprouts ('eyes'), and any green-tinted skin on the tuber. Clemson HGIC's own wording: 'Green portions on potatoes are poisonous, taste bitter, and contain an alkaloid': Clemson does not itself name the alkaloid as solanine. The alkaloid is commonly identified elsewhere (broader toxicology literature, and ASPCA's same-genus tomato entry, which does name solanine as its toxic principle) as a solanine/chaconine-type glycoalkaloid. Pet-facing signs, by analogy to ASPCA's tomato listing (same genus, Solanum, same toxic-principle class, in ASPCA's own words): 'Hypersalivation, inappetence, severe gastrointestinal upset, depression, weakness, dilated pupils, slow heart rate.' Keep pets away from potato plants in the garden and don't feed green or sprouted potatoes.