Definitely tart up the front - first impressions count.
Ditto the hall area - again, it's a first impression. It doesn't have to be expensive to do, either re carpet in something cheap & neutral, sand boards, lay cheap laminate.
Def patch up chipped woodwork. It makes your house look cared for rather than "oooh, I wonder what major things have been neglected..."
The dog could be a problem - TheHouse Doctor is always going on about doggy smells. Another reason to get shot of the skanky carpet . See how well you can patch up the lawn - if it proves to be a huge problem and the house is hanging around on the market, it's apparently quite cheap to returf. Maybe tart up the rest of the garden to detract from te lawn.