Hi Mayorquimby. I think it's all a matter of how loud it is, really. If the DIY was so deafeningly loud that I couldn't hear my own TV, or prevented me sleeping at night, yes, I woul consider it unreasonable. But I've had a neighbour who did near-daily DIY (he did professional carpentry on the side at home, so not really DIY) and it wasn't a problem - I could hear it, but it was not as loud as, for example, amplified music, so it didn't prevent us living a normal daily life.
And with the dog - if the dog was constantly, loudly barking, I would have a chat with the neighbours - perhaps the dog has a problem. We had a dog for 20 years when I was a child (in a detached house), and a dog who is treated well, exercised properly and has enough company doesn't bark a lot. Ours didn't even bark when we had burglars, which is perhaps going too far.
I think if a baby was crying loudly and constantly, I would be a bit concerned and maybe go round & see if my neighbour needed any help - perhaps the baby is ill, or she needs a bit of help with other things so she can give the baby her attention.
Not that I am the perfect neighbour, I am sure. But if I was aware (or suspected) that something I was doing was preventing my neighbours from sleeping/hearing themselves talk/watching their own television etc. I would be very sorry, and would stop it. There is a huge difference between reasonable/ordinary levels of noise, and something that prevents you sleeping/talking etc. in your own house. It surprises me a bit that people don't see that. Perhaps some people have felt victimised by neighbours asking them to be quieter, and are reacting to their own experience? I don't see how Tyler's can be considered unreasonable, when you look at the facts of what she's said.