Don't try to change a hoarder's mind about the reason for his compulsions or try to throw away or give away his collections; it will only make him want to push you away.
If the hoarder doesn't appear to be in any danger, there isn't any need for treatment.
Even so, it still takes a hoarder months or years to reach a living condition that warrants intervention.
Collecting trash and many animals can cause health problems for the hoarder, not to mention the emotional and mental implications of living in a constant state of fear of detrimental effects if they don't hold on to whatever they hoard.
Medication helps with the anxiety the hoarder feels, while counseling helps with learning new, healthier behaviors.