Mittens: Runned over on Main Street
Saji: Disgruntled, disappeared into woods
[forgot name]: Smoke inhalation due to house fire
Excelsior: Heart failure
Buster: Tail dislocated, possibly hit by car, subsequent euthanasia
Isosceles, The Pig, Dukie Ann, Carrots: Old age
Thunder: "Walked off down the beach" is the lie we were told

Dogs

Destiny: Complications from ingestion of snail poison
Chance: Car
Barkley: Car
Lightning: ?