Does anyone's cat do this, is it something I should worry about? I only noticed today as I caught her in the act but she must have been doing it for a while as there is a patch of white wall where she was licking (the walls are light cream). I Google it and it suggests a mineral or vitamin missing from her diet but she is drinking and eating as normal. She is very fussy food wise and prefers dry food although she does get a pouch of wet food daily. I will speak with the vet tomorrow but just wondered if it is something of concern. She is a 5 year old rescue and we only had her 6 months, never had cats before so still getting used to their little ways.