I can not find the post now but if memory serves me correctly some one
wrote about their cat foaming from its mouth.
Recently our cat came out of the window well gagging and foaming at the
mouth. The foaming continued for nearly 10 minutes.
Looking in the window well we saw a toad. That explained the cats
actions. Toads have substance in their skin that can be very dangerous
for pets. Even if they only lick them. ~J~