Name the backup before you need one
Backup cover is only reassuring if it is a real person, not a promise to find someone. Ask the service to name who would step in for your dog's dates if your assigned sitter had a family emergency on the morning of a visit. Ask whether that backup is an employee the service has vetted and insured in the same way, or a casual helper drafted at short notice. Ask if the backup has access to your dog's profile — breed, age, reactivity on walks, fear of storms, the vet's address — before the emergency happens, or whether they would be reading it for the first time at your front door.
Ask whether the backup has met your dog
A replacement who has never been in your home is a very different proposition for a shy or territorial dog. Ask if the service arranges for the backup to join a meet-and-greet or at least one normal visit alongside your main sitter, so your dog knows their face, voice, and smell. If that is not possible, ask what the first solo visit looks like: will they spend extra settling time, use the treats and entry routine your dog already trusts, and avoid introducing new walk routes that day? For a dog who guards the door or panics with strangers, the honest answer may be that only your named sitter is suitable — better to learn that now than mid-trip.
Follow the instructions, the key, and the clock
Ask exactly how your instructions travel to the backup. Feeding amounts, the exact order of a fussy evening routine, alarm codes, and which doors must stay shut get garbled when relayed by phone under pressure. Ask where a spare key lives — with the backup, in a service lockbox, or with your neighbour — and test that route rather than assuming it works. Ask about timing too: how soon after your sitter reports a problem does the backup visit happen, and what happens to a morning feed if the emergency is discovered at the time of the visit itself? A service with a real system will answer with a sequence, not a shrug.
Agree how and when you are told
Decide in advance what you want to hear and when. Most owners want to know the same day if their sitter changes, even if the replacement visit went perfectly, because silence discovered later undermines trust in every other update. Ask whether you will be told before the backup enters your home, which channel the service uses, and whether the backup sends the usual photo and visit report so your record of the trip has no gap. Also ask who your single point of contact is during an incident — chasing a general office inbox from abroad while a backup hunts for the lead is stress neither side needs.
Write the cover plan into the booking
Ask for the backup arrangement in writing with your booking confirmation: the backup's name, their experience with dogs like yours, the key arrangement, and the notification promise. Share any change at home that affects cover — a new lock, a dog now crated after an injury, a cat flap that must stay shut — with the main sitter and ask them to confirm the backup has it too. When you set up a KinsLe Care Pass for the booking, the backup sitter you approve can open the same temporary, clear view of your dog's routine and key details instead of working from a second-hand summary.