1. Breeding
   1. Harsh Conditions
   2. Drug Treatments
   3. Culling Practices
   4. Improper Euthanasia
   5. Improper Feeding
2. Housing / Pet Shops
   1. Housing doesn't meet natural needs
   2. Often too hot / cold, cramped, hard surfaces
   3. Training to be vicious
3. Viruses
4. Bad Owners
   1. Neglect
   2. Improper Diet

Nil