Their fur can get too oily based on climate conditions and the individual skin of the cat. (pets.ca)
The organic chips, commonly inserted under the skin of cats and dogs in lieu of identification collars, can be made cheaply but can only process low - frequency radio waves, giving them distance limitations. (sciencemag.org)
Since it is not available commercially, a specialty pharmacy can therefore compound methimazole into a topical gel or liquid to be applied on the skin of the cat to achieve the desired pharmaceutical action. (1800petmeds.com)