If you want her to urinate in a specific place you need to go out with her on leash and praise her when she goes where you want. If you just put her outside to do her business she is probably going to continue to go on the patio.
If you are trying to housebreak this puppy it would be in your best interest to go outside with her so you can praise her for going potty outside.
I would tend to agree. A puppy doesn't come with instructions, and oft times we tend to forget between acquiring one dog to the next.
You need to work with the puppy, to instill some potty breaking habits in her. She won't learn if you just set her outside the door and expect her to know what to do.
Take her out into the yard and praise, praise, praise, when she pottys out there. Reward her with praise, she will eventually learn that if she goes in the correct part of the yard, not the sidewalk or patio for example, that she is doing something right.
How is she getting along with your other dog? He is still young himself, Labs don't mature until around 2 or more, depending upon the dog. How is he with his potty skills? She will probably follow him out into the yard and learn from him too, if his skills are up to par.
Do you have any pictures of your dogs? I am a big time Labrador Retriever fan. Would love to see your dogs. Are they the English type Labs or American? Colors? Please share more about them.
I will try the leash thing. My first lab was 4 months old when i got her so i have never had a puppy this young. Both are black english labs. They are actually full blood sisters from different litters. i often wonder if they know they are related.
Concrete is easy. If you hose it down after you there won't me any stain or lingering odor. Your pup will be able to smell it though. He leaves scent markers so you may want to get one of those sprays from the pet store to nuetralize the odor.