▁common ▁in ▁early ▁ter riers ▁but ▁which ▁have ▁since ▁fallen ▁out ▁of ▁favor ▁with ▁f anci ers ▁and ▁bre ed ers . ▁ ▁On ▁their ▁back , ▁Gl ens ▁have ▁a ▁unique ▁double ▁coat ▁that ▁is ▁wir y ▁with ▁a ▁soft ▁under co at . ▁The ▁head , ▁sides , ▁and ▁legs ▁have ▁only ▁the ▁so fter ▁coat , ▁which ▁typically ▁develop s ▁a ▁degree ▁of ▁w av iness . ▁The ▁color ▁of ▁the ▁coat ▁may ▁be ▁whe aten ▁or ▁blue ▁( the ▁latter ▁usually ▁with ▁br ind ling ), ▁with ▁both ▁whe aten ▁and ▁blue ▁en comp ass ing ▁a ▁range ▁of ▁sh ades . ▁Other ▁color ings ▁do ▁occasionally ▁occur ▁in ▁Gl ens ▁( including ▁a ▁mixture ▁of ▁whe aten ▁and ▁blue ▁referred ▁to ▁as ▁" g ri zz le " ▁and ▁a ▁" blue ▁and ▁tan " ▁that ▁is ▁blue ▁on ▁top ▁with ▁whe aten ▁furn ish ings ) ▁but ▁these ▁rare ▁variations , ▁while ▁not ▁dis qual ifications , ▁are ▁not ▁fav ored ▁by ▁f anci ers . ▁▁▁ ▁Whe aten ▁Glen ▁of ▁I ma al ▁pu pp ies ▁often ▁have ▁black ▁highlight s ▁in ▁their ▁fur , ▁and ▁when ▁young ▁may ▁show ▁a ▁" d ors al ▁stri pe " ▁of ▁dark er ▁fur ▁down ▁the ▁middle ▁of ▁their ▁back s , ▁but ▁this ▁usually ▁does ▁not ▁appear ▁in ▁their ▁adult ▁coat . ▁ ▁The ▁Glen ▁of ▁I ma al ▁ter rier ▁does ▁not ▁molt ▁or ▁shed ▁much , ▁and ▁needs ▁to ▁be ▁br ushed ▁or ▁com bed