Rochester Common household plants toxic to pets. Plant #5: Philodendrons Philodendrons are considered toxic to both dogs and cats. Any amount of consumption is said to cause severe irritation in Why THESE turning yellow? , Your Pothos is trying to tell you something!, 3 most common reasons:, 1 Overwatering most common cause, 2 Too much direct sun, 3 Old leaves dying completely Philodendron 'PHIL01' PBR Little Phil TM Ponytail Palm