It depends on how much poison the mouse ate and how big your dog is. You should probably call your vet, but if you aren't sure if you need to, you should watch your dog closely.
Poison.
Yes they will be, they will eventually die from the poison. So try not to give them any! :L
Yes
They can not die of eating lemons, although it is very surprising.
I believe that they can.
No, it is not an instant poison.
yes.
problaby but dont try it
On the depends on what kind of dog it is because some dogs are different from others so some of the others might die.
Its possible, take your dog to the vet and have him checked out.
In the movie "The Beguiled", Clint Eastwood's character dies after eating poison mushrooms.
Unless the cricket is laced with poison, it is a natural food for a cat and won't harm it.