You should know when you are willing to provided services free, and when services will be charged on the monthly billing. And you need to make sure your clients understand that, too.
In general, 20% of horses excrete 80% of the total egg output in a herd. Fecal egg counts also provide information about efficacy or resistance of specific drugs used in deworming regimens.
While there is the potential for a horse to be infected by more than 150 different species of internal parasites, there are four main types: bloodworms, small strongyles, roundworms and tapeworms.