I personally have not used DogsB myself, however I do want to point something out.
As far as their sunglasses are concerned, I believe they are Authentic. I am an optician and sell every major designer brand of glasses/sunglasses in a High End boutique here in the states.
However, that being said, be careful with their prices, as I know for a *fact* that they are not wholesale.
Example: When you go to their page, sometimes the price for a pair of Gucci's will belisted as 69.99. When you go to check out though, you will see their prices are in British Pounds. Pounds run about 2:1 for USD. So those 69.99 Guccis just became $140 USD. Gucci typically wholesale for about 60-80(+) USD depending on the model.
So their 'Wholesale' prices are about double normal wholesale. Now, we take the 140 USD and convert to Australian Dollars, which runs about 1:.80. So now those 69.99 gucci sunglasses are now running you about 175 Australian dollars.
I do not know the Australian market, but if 175 AUD is a good price since it includes free shipping, thn I say place a small trial order.
Just something I wanted to point out as many people do not take into account that ALL their prices are in British pounds and some forget to convert.
Best Wishes. Keep us updated if you do decide to purchase.