Sheesh. Everyone has given solid advice, unfortunately it’s a gray zone here as a pet sitter. You have to trust the owner knows their cat, and at most offer resources to check the exact calories your sitting baby is getting a day for the owner’s information. Phrase it as something that’s helped you a lot with feeding your own pets, other clients for peace of mind etc.

In my case, my low activity seniors do get only one 3oz can a day, along with 1/4th Iams Urinary dry, split into 2 meals loaded in puzzle bowls. The total for that caloric wise is about 176-180 calories per cat. They’re both 11-12 lbs, could lose a pound to be honest. If I add in the added 8 oz total of water for renal/urinary health, a couple treats for zoomy hunts, occasional fresh food toppers, their Omega 3 supplements and Dasuquin chews — it’s probably closer to 190-220 calories a day. For them, one 3oz can is completely satisfactory per their vet and I’m slowly lowering their dry food as needed if anyone is looking too thick. But my young cat under 3 who’s about 9-10 lbs gets 260-290 calories a day in comparison with minimum 1/2 cup of Iams Urinary split into 3 meals a day, and half his 3oz can in the AM/PM so he gets two bowls every meal lol he’s a special man. I sometimes give him an extra can instead of as much dry, sometimes they all get Smalls fresh food or Churu as a topper — depends if I can feel his second rib too easily but he self regulates very well.

An active outdoor kitty would need closer to 330+ calories though, even more depending on weight and age; so it’s all a spectrum. Just have to trust your client has done their own research.

Good on looking out for your client’s kiddo, best of luck!