Do all dogs have the same size brains?

No, different dog breeds can have varying brain sizes. While there is a general correlation between body size and brain size, with larger dogs typically having larger brains, there can be significant variation within breeds. Some smaller breeds, such as the Toy Poodle or the Chihuahua, may have larger brains relative to their body size compared to giant breeds like the Great Dane or the Saint Bernard. Additionally, individual dogs within the same breed can also exhibit variations in brain size.