The skin itself is fine — preparation is the point
A dog can eat the skin on an apple or a peach, and in both cases the skin is a reasonable part of the serving because it holds much of the fruit's fiber. The condition is washing: fruit skin carries whatever the fruit met on the tree, in transit, and in the shop, so rinse it under running water and rub it dry before slicing. Serve the fruit in pieces sized for your dog rather than handing over a whole apple or peach, because whole fruit invites your dog to eat the parts that genuinely are a problem.
Apple cores and seeds are what to remove
With apples, the flesh and skin are the treat and the core is the waste. Apple seeds contain a compound that is harmful in quantity, and while the few seeds in one core are a small exposure, there is no reason to serve them when coring takes seconds. The core itself is also tough and can be gulped as an awkward chunk by an enthusiastic dog. Slice the washed apple, cut away the core and seeds completely, and offer a few slices as an occasional snack, watching a dog new to apple for loose stool from the extra fiber and natural sugar.
Peach stones are the serious hazard in this pair
A peach's skin and flesh are fine for dogs in modest amounts, but its stone must never reach your dog. The stone is hard, rough, and exactly the size to lodge in the throat or block the intestine of a medium dog, and the kernel inside it is the part of the peach with harmful compounds. Cut the washed peach in half, remove the stone before slicing, and dispose of it where your dog cannot retrieve it from a bin or compost heap. Never let a dog carry or chew a fallen peach under a garden tree, stones included, and check windfalls if you have fruit trees at home.
Amounts, ripeness, and dogs who should skip fruit snacks
Fruit is a treat, not a food group, for dogs: its sugars add up quickly for small dogs and for any dog on a weight plan. Choose ripe but firm fruit, avoid canned peaches in syrup entirely, and treat dried fruit as a different, much more concentrated product that is best skipped. Introduce one new fruit at a time in a few pieces and watch the stool over the next day. Ask your veterinarian before regular fruit treats for a dog managing blood-sugar concerns, and call for advice if a peach stone is swallowed or a dog vomits repeatedly after fruit, since a swallowed stone is a blockage risk that should not simply be waited out.
Writing the fruit prep steps into the feeding notes
Helpers happily share fruit with a dog and rarely think about cores, stones, or washing, so the prep steps are what the written instruction must carry: wash the fruit, remove apple cores and seeds, remove peach stones completely, slice before serving. Add those steps to the treat notes in KinsLe, and Care Teams will show them to whoever prepares your dog's snacks, keeping the safe skin on the menu and the stones out of reach.