The plural of mouse is...
MIce.
Is the dog small or big?
It's big. / It's a big dog.
What is it?
It's a cat.
What color is the horse?
It's white. / It's a white horse.
Is the cat beautiful or ugly?
It's ugly. / It's an ugly cat.
What is it?
It's a mouse.
What is it?
It's a bird.
Is the bird ugly or beautiful?
It's beautiful. / It's a beautiful bird.
What is it?
It's a dog.
What color is the fish?
It's pink. / It's a pink fish.
What is it?
It's a fish.
What is it?
It's a horse.