Apples can fit as an occasional add-on, not a daily extra.
Verdict: Yes, in moderation. Seeds and core are choking hazards and contain cyanogenic compounds.
What is okay and what is not
- Use the plain version only. Seasoned human food is the usual problem.
- Match serving size to dog size and sensitivity.
- Stop immediately if stool, appetite, or behavior shifts.
Practical serving rule
Slice apple flesh and remove core, stems, and seeds.
A few slices per serving.
Source check: AKC specifically recommends removing seeds and core before serving apples. Source