How Toxic to Cats is an Apple Tree?

A common fruit plant that many of us enjoy can have completely the opposite affect on cats and dogs as well as horses.
Apple

The Apple Tree’s stems, leaves and apple seeds contain the chemical compound Cyanide, which is toxic and dangerous to our pets, especially during the process of wilting.
Signs of your cat being affected from this can include dilated pupils, brick red mucous, panting, difficulty breathing and shock.
You should consult your vet immediately if you have any concerns.
*This information was gathered from http://www.aspca.org/Pet-care/poison-control/Plants/apple