I don't think I'd worry about a massive personality shift. There will be days when he seems like a real pain in the butt. He won't come, when he's always come before. He'll get a little stupid with a dog he's always been friends with before, you might find a pair of shoes chewed one time when you come home...etc. But if on the whole he's an easy going, happy dog, as long as you maintain training he should pretty much stay that way. I don't think over night he'll become an ax-murderer.
As far as neutering goes, from what I've read Intact males are rarely unmanageable as long as training has been put in place. My guy is 14 months old and does not mark in the house and really only marks on walks if I let him (If I'm moving he has to keep moving and there is no time for smelling and peeing). Haven't seen any real territoriality out of him either. When maintenance people come in, he only ever looks at them and wags his tail. We live on a golf course and he just watches the people walk through our backyard. I've sent him through a carwash before, and he just calmly observes the people vacuuming around his crate. Not much of a barker. I think the only thing I would worry about is pack structure with the other dog, but that too can probably be handled through training. Waiting to neuter is better if you can. Personally though, I don't think behavior problems go away with an operation unless the problem's about a female.
And as for the last thing, it's normal. And I've found it usually is more about lack of control than arousement when they're that young. Argos used to pop out every time he sat down. And sometimes it can indicate relaxation, rather than excitement. And it won't go away. Some dogs do it more than others, but they all do it sometimes. I know my dog was my first intact male and initially I was almost embarassed, with the testicles and everything hanging out there. I thought I would have to put pants on him to keep him decent. Truly as time goes on, you won't even notice it anymore.
As far as neutering goes, from what I've read Intact males are rarely unmanageable as long as training has been put in place. My guy is 14 months old and does not mark in the house and really only marks on walks if I let him (If I'm moving he has to keep moving and there is no time for smelling and peeing). Haven't seen any real territoriality out of him either. When maintenance people come in, he only ever looks at them and wags his tail. We live on a golf course and he just watches the people walk through our backyard. I've sent him through a carwash before, and he just calmly observes the people vacuuming around his crate. Not much of a barker. I think the only thing I would worry about is pack structure with the other dog, but that too can probably be handled through training. Waiting to neuter is better if you can. Personally though, I don't think behavior problems go away with an operation unless the problem's about a female.
And as for the last thing, it's normal. And I've found it usually is more about lack of control than arousement when they're that young. Argos used to pop out every time he sat down. And sometimes it can indicate relaxation, rather than excitement. And it won't go away. Some dogs do it more than others, but they all do it sometimes. I know my dog was my first intact male and initially I was almost embarassed, with the testicles and everything hanging out there. I thought I would have to put pants on him to keep him decent. Truly as time goes on, you won't even notice it anymore.
