There are thousands of different types of mushrooms, hundreds that are used for food and over fifty different kind (and the list continues to grow) that offer medicinal benefits. Mushrooms are rich sources of minerals, vitamins, amino acids and many offer cancer fighting properties. There have been numerous studies that link the immune enhancing properties of certain mushrooms to cancer fighting at the cellular level in the body.
Animals as well as people can benefit from the immune enhancing, anti-inflammatory, antitumor, and antiviral properties of medicinal mushrooms such as Reishii, Shiitake, Cordyceps, and Turkey Tail. The list is long and these are just some of the mushrooms that have been proven to be safe and effective when used properly.
Of course all things are not created equal. Some mushrooms are best taken as supplements others cooked and then eaten. Many supplements are made with a blend of several types of mushrooms and have been formulated to support various health conditions. All supplements are not manufactured the same and there is a wide range of both quality of ingredients and processing methods that make the difference in effectiveness.
As with most things, its best to consult with a knowledgeable health care provider prior to taking supplements yourself or giving them to your pets.