So sorry for your loss.
If throats were the only location of fatal injury/consumption, then I'd guess weasel or mink, they can climb very nimbly and squeeze through the eyes of needles (so to speak), raccoon's are rarely so `fastidious'. Set both a standard live trap and - check Youtube for instructions on how-to contruct a `weasel box' (big Victor Rat Trap is main ingredient).
Again, sorry - hang in there - retire the vermin and nurse your gumption.
a weasel only needs less then 1 " X 1" to squeeze into a mink slightly more when using a weasel box bloody liver ( M'rat, pork , chicken does'nt seem to matter )and a little Anise oil works well for bait