i had an older boxer that developed siezures late in life, and she died of a heart attack 4 years later,which was the worst day of my 59 yrs.THere are many things that can bring this on . go to dogtorj.net. he has eiminated 95% of his seizure patients (dogs) with diet. your dog could be borderline celiac, and old age has intensified it.This is common. So agluten free diet is a must. go to the health food store and get some dog food,throw away the grocery store food,it is worse than I can explain.