est ive ▁dis orders , ▁cat ar act s , ▁ent rop ion / ect rop ion ▁e y el ids , ▁progress ive ▁ret inal ▁at ro phy , ▁per ian al ▁f ist ulas , ▁and ▁thy roid ▁dis orders . ▁Though ▁rum ors ▁persist ▁of ▁Leon berg ers ▁being ▁more ▁sensitive ▁to ▁an est hes ia ▁than ▁other ▁bre eds ▁of ▁dog , ▁they ▁are ▁largely ▁un true . ▁Leon berg ers , ▁like ▁other ▁large ▁bre ed ▁dogs , ▁require ▁less ▁dos age ▁per ▁p ound ▁of ▁sed ative ▁than ▁smaller ▁bre eds ▁to ▁yield ▁the ▁same ▁effect . ▁The ▁Leon berger ▁Health ▁Foundation , ▁a ▁private ▁non pro fit ▁foundation ▁whose ▁sole ▁mission ▁is ▁to ▁support ▁major ▁research ers ▁who ▁are ▁seeking ▁to ▁identify ▁gen etic ▁markers ▁for ▁serious ▁dise ases ▁which ▁affect ▁the ▁bre ed , ▁is ▁currently ▁foc using ▁on ▁o ste os ar com a , ▁hem ang ios ar com a , ▁and ▁Leon berger ▁poly ne urop ath y . ▁ ▁L on ge vity ▁Leon berg ers ▁in ▁UK ▁and ▁USA / Can ada ▁surve ys ▁had ▁a ▁median ▁lif es pan ▁around ▁ 7 ▁years , ▁which ▁is ▁about ▁ 4 ▁years ▁less ▁than ▁the ▁average ▁pure bre d ▁dog , ▁but ▁typical ▁of ▁similarly ▁s ized ▁bre eds . ▁About ▁ 2 0 % ▁of ▁Leon berg ers ▁in ▁the ▁surve ys ▁lived ▁to ▁ 1 0 ▁years ▁or ▁more . ▁The ▁oldest ▁dogs ▁in ▁both ▁surve ys ▁died ▁at