The answer to this question, like so many cat-related questions, is yes they probably will, but they really shouldn’t. (You shouldn’t either, by the way.)
Newts come installed with a skin toxin called tetrodotoxin, designed to keep predators from eating them. Some newts, like the rough-skinned newt, are toxic enough that simply handling them can be a problem. Other newts, like the fire-bellied newt, can be handled safely (as long as you don’t have an open sore on your hand or forget to wash your hands before touching your mouth or eyes afterwards).
Most of the time, if a predator tries to eat a newt, it will spit it out right away because the skin toxin makes the newt taste so bad. But if that predator swallows the newt anyway, the toxins will either give that predator terrible indigestion, or worst case, kill it.
So, if you have reason to believe that your cat, dog, child, or excessively hungry adult friend has licked, snacked on, or swallowed a newt, you need to get them medical attention immediately.
The Nine-Year-Old, plaintively: “So I can’t get a newt for a pet either?”
Mommyo, hard-heartedly: “Nope.”
- If you take your Nine-Year-Old to the Shedd Aquarium… (Caterpickles)
- You say fire-bellied newts have skin toxins: How toxic are they? (Exotic Pets)