ID column for the same form but in different tables

I have a few tables:

1) Customer Table >> Under which there is Pet Details Table & Packages Table >> Under Pet Details Table, I have service booking table & the Packages table also I have linked with Service Booking Table.

When I go within a pet & create a booking the Pet ID automatically gets filled & assigns it correctly.

But when I go to the packages table & try to book a service, In the Pet ID column it shows me all the Pet IDS & not for that specific customer. 

How can I make sure it only shows me the Pet ID for that specific customer?

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