This is False.
According to the American Kennel Club (AKC), the misconception about dogs solely seeing in black and white can be traced back to Will Judy. She's a prominent figure in the dog community and former publisher of Dog Week magazine. In his 1937 manual, "Training the Dog," Judy speculated, "It’s likely that all the external world appears to them as varying highlights of black and gray." However, dogs do possess a more limited color vision compared to humans.
Dogster, a reputable source, elaborates on this topic. Their article explains that dogs have dichromatic vision, meaning they possess only two types of cones in their eyes, sensitive to blue and yellow light. While dogs can perceive colors, their interpretation is subdued compared to humans. Notably, dogs struggle to process red light, which hinders their ability to differentiate certain colors. This limitation particularly affects shades of red and green, presenting challenges in distinguishing between them.
American Kennel Club (AKC) -
https://www.akc.org/expert-advice/health/can-dogs-see-color/
Dogster -
https://www.dogster.com/lifestyle/do-dogs-see-black-and-white