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Evan MacLean and colleagues evaluated behavioral and genetic data from over 14,000 dogs, representing more than 100 breeds, and found that certain similarities in behavior between breeds correspond to genetic similarities between those breeds, suggesting a genetic basis for breed differences in behavior. This was the case for both dog rivalry and energy but was especially pronounced for chasing, which can be seen when a dog pursues small animals like birds or squirrels. A different study found that the French bulldog and the bullmastiff breeds exhibit similar chasing behavior, suggesting that

their similarities with respect to that behavior could result from a shared aspect of their genetics.

individual French bulldogs likely display higher levels of chasing than individual bullmastiffs.

French bulldogs and bullmastiffs show a greater tendency toward chasing than most other dog breeds do.

the two breeds will likely become less genetically similar over time.