What dog is the biggest bull mastiff or mastiff?

While both the Bullmastiff and the Mastiff are large breeds, the Mastiff is generally considered to be the bigger of the two.

Here's a comparison:

* Mastiff: Males can reach up to 30 inches tall and weigh up to 230 pounds.

* Bullmastiff: Males can reach up to 27.5 inches tall and weigh up to 130 pounds.

So, even though there can be individual variations, Mastiffs are typically larger than Bullmastiffs.