Demodex gatoi is an unusual cause of pruritus in cats, but given the challenging nature of establishing a diagnosis in cats (Hobi et al, 2011) it is well worth ruling out this parasite as a possible cause (Moriello, 2015).
Karen Moriello reports finding this more oval, rather than cigar-shaped, form of Demodex more frequently in faeces (by faecal flotation) than on skin scrapes due to the cat grooming and ingesting the mite.
The good news is that, if we do find the mite, it is possible to treat (off licence) with Advocate Cat once weekly for six weeks.
Hobi S, Linek M, Marignac G et al (2011). Clinical characteristics and causes of pruritus in cats: a multicenter study on feline hypersensitivity associated dermatoses, Vet Dermatol, 2011.
Moriello, K.A. (2015). Itchy Cats: Evidence Based Diagnosis and Treatment, North American Veterinary Conference, Orlando 2015.