Both Levi (now 8 mos) and Zoe (now 5 mos) developed Demodex flair-up when they were both around 4-4 1/2 months old, when both started teething. Our vet told us that stress could
trigger an outbreak, which does appear to be the case with Levi. Levi is over his outbreak and has his perfect coat
. Zoe, being 3 mos younger is a different story, hers is confined to one small area but is persistent. Goodwinall ointment was prescribed for both of them, I can't say if that is what helped clear it up or just getting through teething.