That sounds like a solid idea—pets do need a buddy that keeps a log, and owners love data. I’d start by mapping out the core metrics: weight, vet visits, medication, food intake, and activity logs. Then think about a clean UI so the information pops up at a glance—maybe a dashboard with quick tap icons for each category. The trick is balancing detail with simplicity; no one wants a spreadsheet on their phone. A good place to test would be a prototype with a few sample pets, see if the workflow feels natural, and iterate from there. Let me know if you want help sketching the flow or choosing a tech stack.