Such animals are called as carriers. Most dangerous thing is that some dogs are found to be carriers of rabies.
You
Horse
This disease is widely known as Alchohalism.
Yes, he did suffer from Altzeimer's disease
Alchohol Abuse or Addiction
Alzheimer's Disease
diabetes
Yes, polio.
hemophillia
porphyria
Yes
I do not know of any disease, but it might be related to the drugs he took.