What is the cheapest way to grow pet in Saudi Arabia?

Selling again to somebody who has already bought. It is not a strategy anyone finds exciting and it is the only one where the cost per order falls as you use it.

The cheapest growth is the growth you already paid for

Ranked by cost per incremental order: owned channels first, then referral, then paid. Most budgets run that list backwards, and the reason is usually that paid is the only one with a dashboard.

Winning a customer costs money and selling to them again costs almost nothing, and most budgets are spent as though the reverse were true. For a pet supplies store in Saudi Arabia, the answer turns on one thing in particular: Pet food is the most reliably repeated purchase in retail: the bag runs out on a known schedule.

What is different about Saudi Arabia

Saudi Arabia is the largest ecommerce market in the region by some distance, and the most phone-dominated.

Cash on delivery remains common in Saudi Arabia, which changes the economics of every refused delivery.

What is different about a pet supplies store

Discounting to grow trains people to wait for the discount. It works once.

Where a mobile app comes into it

This is the clearest case for an app of any category. TicApp built barcode reordering into Pets Lounge for exactly this.