Take him to the vet.
My dog got sprayed by a praying Mantis and his eye is now watery red and squinted. What should I do?
The praying mantis does not spray any form of liquid! You should monitor your dog's eye carefully to ensure that nothing else has got into it.
I would still take your dog to the Vet and have him/her look at his eye right away. A Mantis does have a needle like prong on the ends of it's long ends. That's how they catch food. But they do not spray. There is something else wrong. I have Mantis's all over in my yard and they are harmless to animals.
First rinse his eyes out with lots of water and if persists or gets worse, take him/her to your Vet. This is the first Ive ever heard of a praying Mantis spraying anything lone less a larger animal cause they usually use their pincers for defense and that's what they used when wee use to catch them when I was young