How do health reminders work?

When they arrive. Around 8am when a vaccination or parasite treatment is due within 7 days or overdue by up to 30 (at most once a fortnight per item), when a vet follow-up is today or tomorrow, and when council registration expires within 14 days.

Push only. No emails. Tapping the push opens that pet's health record.

Turn them off. Per pet under "Health reminders" in the record, or for everything under Settings → Notifications → Reminders.