Can I build a Lookalike Model on a targeted segment of customers?
We suggest that you build your Lookalike on all customers because the more data the model has, the richer it is. In addition, the lookalikes will already consider characteristics suggestive of qualities like high LTV. Also, in order to ensure this is a true prospecting/acquisition campaign, we need your full customer file for a suppression.
If you wished to target a certain group, Pet Owners, for example, and if your existing customer demographic was largely pet owners, pet-owning prospects would likely already be heavily present in the prospect pool. Lookalikes tend to mirror your existing customers.