Disease

Disease
Disease is a kind of potion effect. Animals are only infected. The sick walk slowly and consume much energy(hunger). It remains one minecraft day and it's enough time for the animals to be starved to death.

Cause
Pile of excreta makes nearby animals sick.

Cure
Mushrooms are cure for this. Red and brown both are effective. Right click the animal with the mushrooms. In other way infected animals are naturally cured after a minecraft day.