A hobby farmer, like a commercial farmer, must keep an eye on the health of the farm animals by checking them routinely. Daily observation tells you the animals' habits, and will help you determine if something is wrong or if your animal is sick.
The following signs are warnings that your farm animal has an illness:
The animal is lethargic or just not very active.
The animal isn't eating.
The animal is getting thin.
The animal's milk production is off.
There’s a change in the animal's stools (you notice diarrhea or straining and a lack of stools, indicating constipation).