I see strays from time to time and I do often wonder if they belong to someone. Is the idea that I'd be able to report the stray on the app and hope that the owner has the app too and sees my report?
The first is getting mass adoption of your app, and tell people what makes it so much better than what we already have (facebook/twitter/nextdoor/instagram/etc).
Also lost pets are common, but they might rarely happen to you. That might lead to the second issue which is notification fatigue and uninstall the app. Or people will forget, and simply uninstall the app since they never use it.
I think a better solution is putting an airtag (or an rfid tag) on your pet, along with a telephone number on the collar to call.
Orange was chosen to be bright and align with prisoner garb. It’s such a good simple idea and the complete negativity of the internet pretty much killed it.