Dog DNA testing has anyone tried it?

I have been very curious to try one of these Dog DNA tests on both my dogs. Just out of curiosity and for fun. I have my ideas on what my dogs maybe but would really love to see if the test matches what we think they are. Has anyone used one of these tests and were the results what you expected or even remotely accurate?

Has anyone ever done a DNA test on their dog?

Just curious, one of my dogs is a mix from a shelter, so we have no idea what he is except a little bit border collie. I don't think I would ever do it but I was wondering if anyone else has, it seems interesting to me that you could find out that kind of thing.
I posted pics, I wasn't going to but why not I guess.

And I did check around, it's like 0 and I don't care so like I said I wouldn't do it. Just wondering if anyone else has, geeeeez.

We have a mutt and were curious in finding out what breeds she is made up of. I've heard of sending your dogs DNA to places to find out what they're made up of. I was wondering if someone can recommend a good place to do this, that's affordable and accurate. Has anyone else done this, and if so, what kind of results did you get?

DNA testing to find out the breed of a dog?

I've heard of a few places online in which you can send in a sample of your dogs blood and they'll run a DNA test to determine the breed(s). Has anyone tried these? Do you believe they are accurate?

How many bases does a dog’s DNA have?

I know humans have 3 billions bases but how many bases do dogs have in their DNA?

We have a mutt and were curious in finding out what breeds she is made up of. I've heard of sending your dogs DNA to places to find out what they're made up of. I was wondering if someone can recommend a good place to do this, that's affordable and accurate. Has anyone else done this, and if so, what kind of results did you get?