Mastiffs generally do not dart out. I have never had this problem with the 2 I have had. They like to be near their people always. For instance.......Linc won't go play at a dog park. He just stays beside up so we don't even go. Plus too many unpredictable untrained dogs there. I find mastiffs (mine anyways) don't get that hyper craziness when someone comes to the door.
These guys need to be super socialized and trained. It's a must.
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I find this already with my Lillie and she's only 4 months old. She does not dart, and she learns VERY quickly from impulse control excercises, free shaping excercises, games, etc. much more quickly it seems than obedience commands.
Lillie is my first puppy, but not my first large, guardian breed dog. I would put in a plug for making your first a young adult from a reputable rescue that temperment tests and fosters their dogs. They will match you with a dog of the disposition you are looking for and you won't have to worry about a puppy with young children. Also, I won't lie, I was surprised by the time, even though I was prepared, that a puppy takes. I work from home, and I swear, my life has revolved around this puppy for 2 and half months. What time I go to bed, when I get up, what I do on my breaks, on my lunch, in the evening, where I go, how long I'm gone... and then there's the training, the classes, the socialization... it is endless. And while it is wonderful, the time and effort it takes to socialize and train a dog of these breeds is really something to consider. The guidline is for the puppy to meet 10 new people a week and go to 3-4 new places from 8 weeks to 16 weeks. This is one of the most important windows of development for a puppy and once it's closed, it's closed.
Also, we've been through 8 weeks of puppy K, start 8 week of obedience 1 in Sept, then 8 weeks of obedience 2 following that. We will likely move directly into Obedience 3, then onto Rally as I may title her. While level 3 obedience and Rally probably aren't "necessary", up to level 2 is, and my breeder actually puts it in her contract.
I've had absolutely wonderful rescue dogs - I currently have a Staffy/Mastiff X who I adopted a year and half ago from a shelter and he is now a certified and working Therapy Dog. He is easily the best dog I've ever had. Take a look at ABARS:
http://bullmastiff.us/available-rescue-dogs.html
Puppies are wonderful, they are, but there's a lot of fantastic mastiffs out there who need homes, and I feel like every young adult dog I've adopted has been preparing me for the wonderful little puppy I finally got. But they were ALL easier than she is!