Puppy english mastiff behavior?

i have a 8 month old english mastiff. as he has gotten older his behavior has gotten worse, he is becoming very stubborn, very rowdy and sometimes rough. he has not been neutered. i would like to refrain from having him neutered. for anyone who has/does own a mastiff, is this behavior normal for his age, will he grow out of it?

the reason i dont want to neuter him is because he has an excellent championed bloodline, gargoyle gropetti was his grandfather, and i dont believe in having an animal fixed for no reason, it is not natural, maybe if more of these tree hugging liberals were fixed the world would be a better place

It is absolutely normal, as he is going though the rebellious teenager phase..
Keep consistent, and give him more challenges, such as competition obedience training..
Keep his mind busier than ever, as teaching, equals parenting, and will enhance his respect for you..
Not much different than 'kids' huh?

probably if not take him to a dog trainer

Mastiffs like to play rough. Of course, with proper training, he can become a great dog.
Out of curiousity, why are you trying to refrain from neutering him?

English Mastiffs were bred to be guard dogs. It's in their blood to protect. They can become possessive and can also become combative with other dogs. I suggest proper training and socialization. You need to let a guard breed know that you're the boss, and other people and animals are okay. Otherwise, they can become dominant and aggressive.

Dogs that aren't spayed or neutered also become more aggressive and dominant, and also get a lot of health problems like cancer and so on. Not getting your dog fixed can be so harmful as to kill it! Please reconsider.
Best of luck, hope this helps!! :]