After the 3rd night of intermediate obedience at the K9 Academy (our 2nd series of classes), I am happy to say my 7.5 mo old Mickelson is the best mannered pup in the class. That coming from the trainer not me being biased. There's a 3 yr old American bulldog in the class and and a 6.5 mo old Cane Corso or Italian Mastiff (whichever you prefer) and those two dogs absolutely hate each other. Also a couple other labs and mixed breeds that get along with **** without issue. He loves to learn and work hard for the hour we're there and mostly ignores both those dogs. Last week we tried a controlled socialization with the Cane Corso, and he would not have any part of it without trying to attack ****. We just keep our separation and keep working. I have only ever been around a 245LB English Mastiff, which was the most laid back dog I have ever seen. This Italian may be the most aggressive pup I have ever seen in my life. He's recently neutered due to young aggression and I don't think it has had time to kick in just yet. I'd just hate to know I paid that much for a dog and have that kind of behavior to try to curve and be able to trust it.