Parasites can be both external and internal. External parasites may be fleas, ticks, mites, or lice. (see specific names for details). Internal parasites may be kept under control with good herd management starting with a good nutritional program, feeding up off the ground, good sanitation, pasture rotation, and a good deworming program for your area and the weather. Signs of internal parasites may be a general lethargy, weight loss, a depressed stance, and ploppy stools or diarrhea. (See Deworming, Meningeal worm, Coccidiosis)