Superb response Johnny.

The only exception I would put in there is if you have collected a local amphibian and are feeding it with locally collected wild caught food. For example, I've been feeding wild caught crickets to my wild caught Texas toads (I collected the toads on Wednesday night) - after summer is over and the crickets are hard to find I intend to treat the toads for parasites but in the mean time in this case there's unlikely to be any harm done since the toads almost certainly already have all the parasites they're likely to get.