i like it very much good imagination did u base it on any current chapters or did you think it up entirely yourself?
Yes and No
I guess you can say that they are based off of many chapters due to all the many similarities; but the Black Dogs are something I have been working on for years ever since I first got into 40k.
When I first started them I wanted them to be original; but I made most of the same mistakes as those who first start their own space marines. That's when I realized I needed to research everything about space marines that I possibly could and as I did my research I took down many notes for possible ideas until I literally had several notebooks of possible origins and histories.
At that point I went with the most likely origin and added some of my own touches to make them unique. By doing all of that I came up with an Astartes that I can definitely say is mine, very unique and the possibility of them surviving in 40k is very likely.