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There's a big difference between demodex in dogs under about 18 months, and dogs over that.
In dogs over 18 months it's much more serious as it can indicate an underlying problem.
My 11 year old has demodex. The vet said if we found only one spot, he'd let it stay in the "sh*t happens" category but if we found a second one, he'd treat it aggressively.
Sure enough, 4 weeks later, we found a second spot.
Check her real carefully for any spots of thinning hair, especially on all the feet, between the toes, front legs, muzzle, and head. If you see any more suspicious spots, have them scraped. If she has any other than on the foot, at her age (and esp. if the mites are in various stages of growth; i.e., larvae, nymphs, adults) it's considered generalized and needs to be treated more aggessively (the systemic ivermectin that was mentioned).
Also, if you find more than the one patch you will want to have him run at the very least a full blood panel to be sure there's not an underlying disease. I believe hypothyroid is one of the more common contributing factors, but anything that can supress the immune system becomes suspect.
Feel free to PM if you want.
CH Rosewood Little Giant VCD3 UDX VER RA TDX MHU SH MXP MJP MFP T2BP DJ VCX WCX CCA CGC FFX-OG (born 3-10-2007), also UCH HR UH UUD AN UJJ URO1 UHIT a.k.a. "Tito" (the Tito Monster)
waiting at the bridge:
My first dog, and my most special girl
Gibson's Golden Girl, CD, CGC, TDI ( 3-20-1997 - 11-22-2013) a.k.a. "Tiny", "Queen B"
and my heart dog
Gibson's Golden Guy, CD, CGC, TDI ( 01-31-1998 - 01-02-2012) a.k.a. "Toby", "HRH"