Some great advice already! I have dogs and built a fence around the garden. It wasn't anyhting fancy, just posts and pickets. The pickets are spaced just enough to allow for air circulation yet keep the dogs out.
I would suggest you NOT use railroad ties, especially for a veggie garden. I don't even recommend using preservative wood. From [url=https://www.ces.ncsu.edu/depts/hort/consumer/quickref/vegetable/intensive_veg_gardening.html]this site with lots of other helpful in[/url]fo:
The sides of an enclosed raised bed are often made of treated wood. Green pressure-treated lumber, has been treated with cromated copper arsenate (CCA) or ammoniated cooper arsenate (ACA). These two preservatives are the safest for the garden because of their very low tendency to leach into soil. Research studies have shown that there is very little chance of ingesting arsenic in vegetables near treated lumber. Because of the arsenic in the wood, however, wear rubber gloves and a dust mask when sawing the lumber. Avoid using creosote-treated railroad ties. Freshly treated creosote lumber can leach into the soil for several years and continues to give off vapors over a seven to nine year period.
More info on pressure treated woods.
You might want to have a soil test once you select a site and add your soil. I would suggest you add a ratio of 40% compost to 60% soil to help make your plants happy.
Another thing you can do is lasagna composting aka sheet composting over the winter once you've harvested your fall crops. That will help your crops for next year.
Your local extension service should have some helpful info on veggie gardening in your area.
Yup, found it. Here's info on planting a fall garden and more.