I love this page and how well they describe the process to build these raised beds. The plans look simple, but. Think I'd make the corner posts a bit higher and affix chicken wire to keep the dog out.
This really works - we did it for our raised beds and regular garden, no weeds for two years!! The newspaper will prevent any grass and weed seeds from germinating, but unlike fabric, it will decompose after about 18 months. By that time, any grass and weed seeds that were present in the soil on planting will be dead. It’s green, it’s cheaper than fabric, and when you decide to remove or redesign the bed later on, you will not have the headache