I have had my 4 month old mastiff pup since she was 8 weeks old, Both her parents were friendly. I hope you have lots of insurance. She was the runt, the last to go and is extremely shy and nervous. The first of these fear periods occurs among puppy Mastiffs between eight to ten weeks old and the second among puppy Mastiffs between six to fourteen months old. I have a 4 year old English mastiff, Mason, most lovable affectionate dog I have ever owned. My dog, Monty, who is a little over a year and a half has in the past few months, starting in March or April become increasingly aggressive. Discussion in 'General Mastiff Discussion' started by Slick561, Dec 19, 2016. Mastiff suddenly aggressive. Typically, aggressive behavior is a “learned response” and/or results from a lack of proper socialization during the dog's developmental stages. Aggression is both a learned and an inherited trait. Though the English Mastiff temperament makes the breed extremely gentle and loving with family members, the massive size of these dogs makes them best for a more experienced dog owner. Obviously a dog of this size and power is capable of seriously injuring or killing other animals. Typically she hides from them. The strong temperament. I would not risk keeping a Neapolitan Mastiff with another dog of the same sex. Mastiffs are inherently predisposed to having a higher level of “suspicion” then other dog breeds making them suitable for guard work. Potential animal aggression. She is afraid of passing cars, bouncing balls, approaching people, just about everything. Question on English Mastiff aggression? Thank you for reaching out to the Mastiff community. Mastiffs tend to … A giant dog that bites is a liability. Socialization is critical in shaping dogs’ behavior especially during these two “fear periods”. Are Mastiffs Aggressive? AGGRESSION TOWARD HUMANS. Good luck, and I commend you for taking action now while he is young and pliable. Most English Mastiffs are polite with everyone, but there is timidity (even extreme shyness) in some lines, and aggression in others.. To ensure a stable temperament, English Mastiffs need earlier and more frequent socialization than many other breeds. A typical Mastiff's temperament, by nature, is one of gentle demeanor. However, as with any breed, the Mastiff can become aggressive for varying reasons. If they can manage to get close enough to pet her shes fine, but she jets as soon as they look away. At first when she was younger we thought she'd grow out of the timidness, but she hasn't. I try to walk her every day but she lags behind me and ties to turn around because she wants to go home. I've got an English Mastiff I've had since she was a puppy, shes about 3 now. Often described as gentle giants, English Mastiffs weigh in at around 220 pounds or more and stand between 28 and 36 inches tall. 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