Based on this product's specifications, here are some alternatives and similar models
Dog harness Barry King Equilibre XS 13 mm leather with nickel fittings — neck 20–30 cm, chest 25–45 cm, Black Zebra
Summary description:
A Barry King Equilibre XS dog harness made of leather with nickel fittings, 13 mm strap width. Designed for small dogs with neck circumference 20–30 cm and chest circumference 25–45 cm. Features adjustable straps for secure fit, durable metal hardware, and a patterned Black Zebra finish. Suitable for everyday walks, training and controlled outdoor activities.