I live in Anchorage as well and tons of my coworkers bring their dogs with them, I actually was just asking some of them this question. They bring their dogs during the winter, with blankets, toys, food and water, and a pee pad on the floor, they park close to the building to "monitor" every now and then too. Everyone says that they start their car for ten mins at least every hour and they walk them on all their breaks, almost everyone will take their dogs to the dog park off of Elmore for their whole lunch break as well... I feel like if your smart about it and it's not too cold it's a good idea. Like everyone left their dogs at home today cause it 12 degrees out, but they plan on taking them tomorrow and next week cause it's going to be warmer in the loow 40's.
There are a lot of crazy opinionated dog freaks out there, not to be rude. I just feel like people arnt using common sense when replying and assuming people will leave their dog in the car in 100 degree weather.. Just use common sense is what everyone has told me, and if you bring your dog don't forget the mini walks on your breaks and doing something super active on lunch... Hope this helps :)
It scares me to think about the other extremes--warm weather gets hot in a car very quickly. On a 70-degree day, the temperature inside a parked car can soar to between 100 and 120 degrees in just minutes, and on a 90-degree day, the interior temperature can reach as high as 160 degrees in less than 10 minutes. It's like putting a dog in a greenhouse and cracking the windows does not make much of a difference.