Kidney failure is a death sentence. I've had a cat with kidney failure - you don't want to go there, trust me. Luckily, these are seldom eaten by animals because other, more appetizing things are available, such as grass. You can easily find several poisonous plant lists on line by using a search engine. Yes, I mean the name-brand products you find everywhere, that you assume must be safe because everyone sells them.
Pets can often have violent allegic reactions, and some pets actually get sick enough to die.
I had a cat who was very allergic to flea control products, her allergic reaction was much worse than flea bites, poor thing. These will kill your pets just as surely as they kill rodents. Pets can be secondarily poisoned if they eat a rodent that's consumed the poison, too, so please be careful. I was too little to do anything about it but cry helplessly. Their website is very informative and easy to use.