Animal/farm sitters should be shown the law codes about felony animal cruelty, and told that neglecting your animals is a felony crime which will be reported.
I have a sister that I believe has full blown Narcissistic Personality Disorder, she lacks empathy, uses and abuses others, sees her pets only as status symbols, etc.
A friend asked her to care for his dog over a three day weekend while he was out of town. The beloved dog was 17 years old. My sister took to her bed for the weekend with a migraine. I checked on her often and made trips to get her pain meds and snacks, etc. She could have easily asked me to care for that dog.
I had no idea the dog was not being fed or watered, because that's inconceivable to me. If anything, I assumed she'd arranged for one of her friends to care for the dog.
When the dog's owner came back he found it paralyzed and near death. He was furious. I listened to my sister in amazement as she made excuses, like: That dog can go around and get whatever it needs from the neighbors...and, He's exaggerating, the dog really wasn't in bad shape...and, holistic vets recommend fasting for dogs, etc. Not one ounce of remorse or compassion.
But my teenaged daughter soon went to work for the vet who treated the dog, and she looked up the records, so we know that truley the dog had almost died.
My sister was a dog breeder at the time, and a horse owner at the time, plus had cats, and was a single mom. She had her masters degree and a good career. Does that sound like a responsible person to you?
Her image matters more to her than anybody's feelings.
Because I knew the truth about her abuse of that dog, she began to slander me all over town to discredit me just in case I ever told anyone.
Don't trust anyone to care for your animals unless they have a lot of good references, and even then keep checking on them. I used to work with horses, and I made extra money by farm sitting and horse feeding for people who were out of town or busy, but even though I had great references the owners always called me a couple of times a day to check up, and they had their neighbors double checking too.
Also, I only know of one case where a dog escaped from a boarding kennel and was lost; but I know of quite a few cases of dogs that disappeared when a pet sitter was hired to care for them at home. Even if you get a farm sitter, it's much safer to board your dogs at a reputable kennel or veterinarian.