So sorry for you loss....scared at all times with my little chis getting injured by wildlife.
We have a herd of deer anywhere from 4 to 9 deer that run most of property, 4 acres, with fawns frolicking around, the deer respect the doggy pen  area.  I have 6 chis, a collie and a foster min pin. I check every morning and evening, mainly for the 3 black bear that are around here, within 5 foot of house (wildlife path up our driveway).  I have to make sure fencing is still up before letting them out at all times.  Our chis, under 10 lbs are wee wee pad trained and are allowed out only when one of us can sit and watch to make sure deer, bear, owls, cougar or eagles swooping down on them.  
Came to close one time with the bear, neighbor yelled bear so I was on alert and checked my driveway to see it walking directly towards my doggies, had to scare it off.  Glad this bear is skiddish so far.