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==Application==
==Application==
There are numerous ways in which ectoparasiticides are formulated. They can be in solutions, suspensions, emulsions, powders and shampoos. A common formulation seen in practice is when they become incorporated into a plastic matrix, which the product can be released slowly. This use is often seen in flea collars or in cattle ear tags. They can also be given orally or systemically.
For small animals though the most common method is via a spot-on treatment. These can work on the surface by spreading over the skin in a lipid layer, or systemically by being absorbed through the skin and then distributed through the blood.
For large animals sprays, pour ons or dips are the most common. These all work in a similar way to the spot-on formulations.
===Dipping===
The dipping of sheep is a requisite to control ectoparasites in the sheep population. It is though quite a tricky process to get right and a failure at any one of the points could mean that the sheep aren't covered against parasites or that resistance may build up within the parasite population. On the other hand if the concentration of the dip is too high there is significant danger of toxicity to both the sheep and the handler.
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