Toxoplasmosis is a disease caused by a microscopic parasite called Toxoplasma gondii (T. gondii). It is not a new disease, having first been discovered in 1908. Many warm-blooded animals including most pets, livestock, birds, and people can become infected with T. gondii.

Feline leukemia virus (FeLV) is one of the most common and destructive of all cat viruses, but there are other serious cat viral diseases.

Lyme Disease (Borreliosis) is a widespread, potentially serious disease that can affect dogs, cats (less commonly), people, horses, cattle, birds, and wild animals.