0 Pooches: Did you Ever Doubt?

How were you sure that the pup you ended up with was meant to be yours?
And did you ever have any doubts?
A friend of ours just adopted a new pup and while the little guy is really great, and he doesn't have any issues, she's not feeling that he was really meant to be "her dog". She had always wanted a larger dog, but the rescue thought this little guy would be a better match for her.
Though it has only been a short time, she says she doesn't feel a connection with him, and she's not sure if it's better to wait it out and see if her feelings change over time. Though at the same time she feels really guilty. She's not sure if she really is the best human for him, if waiting it out will just make him more attached, and he really does have a better family that would adopt him.
We weren't really sure how to answer, so we were curious to hear some other thoughts.

Though most people don't talk about it, I think at some point many of us have been overwhelmed and wondered if their pup is the right fit.
At one point,  I even wondered that with Miss M.
Young Miss M was a crazy pooch with a lot of energy. She didn't know how to sit still, and every minute I needed to find activities to entertain her. Several times during a single walk, she would look back at me, grab her leash and start playing tug-of-war.
She would usually win.
Looking back, I really think it was this challenge, and the time we spent working together, that strengthened our bond. I knew she was my one and we were meant to always be together.

At the same time, before we adopted Mr. B there was another pup that we almost adopted.
At the time, we knew it wasn't a good fit, but it was hard for us to say so because so many people were counting on us.
He was a nice pup and we took him into our home on a foster-to-adopt status. The rescue was excited and they kept saying how we were the perfect family for him. Miss M loved playing with him and she thought he was the perfect dog for her. But...we weren't sure he was the perfect dog for us.
He was a young dog and each morning we would be awoken to dogs rumbling, wrestling, and leaping over furniture. He needed longer walks than Miss M, and since she couldn't keep up we needed to do separate walks. We weren't sure we could live like that for the rest of our lives. We felt really pressured into taking him because everyone was so excited, and it was really hard for us to tell them it wasn't going to work out. We felt like we let everyone down and that they would all hate us.
Though in the end, that pup ended up with an even better situation (a single girl who loved going on long runs with him!) and we ended up with Mr. B who is the perfect antithesis to Miss M.

We would love to hear everyone else's experiences. How did you know that your pup was the one? Did you have any doubts? Do you think it is better to wait it out? Or to not allow him to get too attached and work on finding his best family?

Also:
How my One helped me find my other One.
Miss M's One
Admitting when it's not working out

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