Is dropshipping worth starting for a pet supplies store in the GCC?

Worth starting, yes — worth staying in, only if something changes. Dropshipping is the cheapest way to find out whether anybody wants what you are selling, and close to the worst way to make a living once they do.

The honest answer

Treat the first six months as paid research. The moment a product sells repeatedly, the margin argument flips: holding stock on that one line usually doubles the contribution per order, and the capital needed is small because you already know it sells.

Dropshipping trades margin for not holding stock, and the trade only works while traffic is cheap. For a pet supplies store in the GCC, 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 the GCC

The GCC is not one market. Payment habits, delivery norms and language expectations differ enough that a single approach underperforms in at least one country.

Payment preference varies by country more than most planning assumes.

What is different about a pet supplies store

The part nobody plans for is returns: if the supplier will not take one back, the store is the returns department.

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.