I have a 10-month-old golden retriever. I have had some helpful advice on here regarding his often challenging behaviour. On the whole he is lovely, though!
However, he is so dog obsessed that even the trainer at the dog classes he was attending agreed he should quit. He tried to mount a passing female dog and it was incredibly difficult to pull him off.
He is also going bananas on walks, leaping at lamp posts and burying his head in nasty-looking patches of undergrowth and inhaling the scents there. He also flies at passing female dogs.
Anyway, yesterday he jumped up at me (he knows he is never allowed to jump up) and I saw he had an erection 
All the advice is not to get a young large breed neutered, but I can't have him going on like this.