Collie has a dedicated sitting workflow. You invite up to 2 sitters by email for exact dates; they sign into the Collie app (free for sitters) and get a briefing with each pet's routine, feeding details, meds, and your emergency vet contact. They work through the day's tasks, then post an update with notes, photos, and their visit times, which the family sees as a visit report. Access starts and ends automatically and can be revoked anytime. In DogLog, a sitter joins the pack like any other member; time-bounded access, briefings, and visit reports are not publicly documented.