How much to charge for FULL time dog sitting?

Hi Sitters! I just finished house-sitting a dog where I had to be with the dog full-time, the owners never wanted to dog to be left alone. I watched the dog for two weeks, and also fed their cats and scooped litter as well as watered plants a couple of times, and I think my excitement to book such a big gig blinded me and I accepted WAY too little money for it. I didn't charge extra for the cats or anything, and I charged a small amount for the dog. I went a little stir crazy during the 2 weeks because not leaving a dogs side 24/7 was a little more overwhelming than I anticipated. How much would you charge for this kind of request? How would you justify the cost? What is the average? It was in the Bay Area (Berkeley). I don't want to overcharge because I want to build up clients, but it hard to know your worth when you are just starting out. Thanks for reading!