What kind of horse is kind of white not very light and very strong?

The horse you’re describing might be a gray horse, which can appear almost white but retain a darker pigmentation in certain areas. Gray horses are often strong and muscular, making them popular for various equestrian disciplines. They can have varying shades, from dApple gray to a near-white appearance as they age. Breeds such as Andalusians or Percherons often exhibit these characteristics.