Fair play to the good people of Felpreva, who replied very promptly to my email about Louis Catorze’s discoloured fur. These are the points that they made:
Following application of any topical spot-on treatment, there is sometimes a powdery white residual left behind; although this is normally brushed away or wiped away with a damp cloth once the application site is completely dry (usually >72hrs). I presume you have tried wiping this mark away previously with no success.
Erm, no, I haven’t tried. Catorze absolutely won’t tolerate any kind of messing in his neck area, so there is absolutely no point.
Cosmetic effects such as a temporary spiking of the hair at the application site are commonly observed, however we would not expect to see a colour change (unless temporary changes due to the residue, as mentioned above).
So the likelihood is that it’s just a temporary external thing, rather than permanent damage? Ok. I can live with that.
The only other explanation we could possibly consider may be a ‘contact colour transfer’ – where your cat may have rubbed/brushed/slept against something white whilst the site of application was still wet and the liquid has subsequently reacted with the inorganic material causing transference of colour to your cat’s fur.
Ah. Bingo. Catorze is the king of trying to roll his spot-on onto whatever absorbent surface he can find, just to spite us.
Anyway, the white discolouration seems to be fading now, thank goodness. And, even when it was at its worst, it didn’t seem to be bothering Catorze. So I don’t need to worry about the little sod being bleached bit by bit until I finally end up with a Chat Blanc.
As you were, Mesdames et Messieurs.
For more Catorzian capers, please visit http://louiscatorze.com
louiscatorze.com 
Leave a comment