You are updating the current relationship behavior of the primary owner (Contact) to pet relationship.

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Delete: Currently set to "Cascade All," which is causing the issue of deleting the pet records when the Contact record is deleted. This should be changed to "Restrict" to prevent deletion if related Pet records exist.

Reparent: Since any active bookings should be updated when the Pet's primary owner is reassigned, the Reparent option should be set to "Cascade Active" instead of "Cascade All" to ensure that only active bookings are updated, not inactive ones.