Don't feel too bad. If you don't know what you're trying to cut, it's very tempting to just cut off the neck of the tubers.

At first glance, in a pink dahlia that size, Otto's Thrill came to mind. It's fairly common in the big box stores. The link below is a bad photo, but see what you think. When I grew it, it had a very pale bit of yellow in the centers not visible in this photo.

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I can't tell from your photo if you have all pink,pink and white, or pink and yellow?

Here is a link that might be useful: Otto's Thrill?

I don't think it was Otto's Thrill, because the flowers were a really deep shocking pink, only white/yellow at the center of the bloom and the base of the petals. I'd post another image if I could figure out how to.

Go to the "Kenora Superb" thread just below here in the gallery, and read about posting photos. Maybe one of those methods will work for you.

Thanks, I didn't know it was so easy to post pictures. Here's the link:

Here is a link that might be useful: dahlias