To quote the article.
“On Feb. 9, Arakawa picked up one of their three dogs — the dog who was later found dead in the home with the couple — from a vet hospital after a procedure, which may explain why the dog was discovered in a crate when the bodies were found, the sheriff said.”
Its just so weird, maybe this sounds silly but she was fine enough to go pick up the dog from the vet and bring him into the house, yet she died soon after coming home?