▁the ▁first ▁sign ▁of ▁lim ping . ▁ ▁After ▁the ▁age ▁of ▁ 1 2 ▁months , ▁Gl ens ▁generally ▁do ▁best ▁on ▁a ▁di et ▁lower ▁in ▁protein ▁than ▁other ▁bre eds . ▁ ▁Tem per ament ▁and ▁behavior ▁ ▁Glen ▁of ▁I ma al ▁ter riers ▁can ▁be ▁ener get ic ▁and ▁t ena cious , ▁but ▁they ▁tend ▁to ▁be ▁more ▁even - temper ed , ▁more ▁easy going , ▁and ▁less ▁vocal ▁than ▁most ▁other ▁ter riers . ▁While ▁they ▁love ▁activity , ▁they ▁are ▁not ▁demand ing , ▁and ▁are ▁happy ▁to ▁relax ▁by ▁their ▁owner ' s ▁side . ▁ ▁Their ▁b ark ▁is ▁deep ▁and ▁author itative , ▁like ▁that ▁of ▁a ▁much ▁larger ▁dog , ▁and ▁they ▁are ▁said ▁to ▁be ▁good ▁watch ▁dogs . ▁ ▁The ▁" G len ▁sit ," ▁in ▁which ▁the ▁dog ▁s its ▁on ▁its ▁h ind ▁end ▁and ▁holds ▁its ▁entire ▁body ▁vertical , ▁is ▁a ▁post ure ▁not ▁commonly ▁seen ▁in ▁other ▁bre eds . ▁ ▁As ▁ter riers , ▁Gl ens ▁can ▁have ▁a ▁stub born ▁stre ak , ▁but ▁they ▁respond ▁well ▁to ▁a ▁firm ▁hand ▁and ▁can ▁with stand ▁correction ▁when ▁necessary . ▁They ▁are ▁intellig ent , ▁learn ▁quickly , ▁and ▁social ize ▁easily . ▁They ▁are ▁typically ▁fear less ▁and ▁loyal , ▁and ▁are ▁super b ▁with ▁people , ▁including ▁children . ▁However , ▁some ▁can ▁be ▁dog - ag gress ive , ▁especially ▁when ▁prov oked . ▁ ▁By ▁m atur ity