Maverick Maverick is our English Mastiff Puppy. Maverick came into our lives about 3 weeks prior to the loss of our beloved Chewy. Having him in my life was a blessing at the time. At nine months of age Maverick weighs about 120 lbs and is still growing! What a big baby. And he thinks he is a lap dog. But for a dog of his size, he has the sweetest disposition. He is like a great big teddy bear!