Most people who hoard animals have a very small social circle; very few family members or friends visit their home. Their houses may be hidden in rural locations or smack in the middle of a busy neighborhood. They may be large farm houses or tiny salt boxes, and there may be absolutely no sign of problems for the casual passerby to pick up on.
Hoarders are generally people who love animals, but their ability to recognize when "enough is enough" becomes impaired -- sometimes severely. It is those severe cases that take a huge toll on the animals; living in overcrowded and unsanitary conditions, disease spreads fast. The animals can become infested with parasites, both internal and external. Something as simple as fleas can cause serious problems, such as tapeworms, skin infections, allergies and anemia..." More