If it has other viable "eyes" then it should be able to grow new sprouts. This thread should help detecting the eyes.

It should be okay. In fact, you may find it replaced with a few sprouts.

Each dahlia eye is actually three eyes if you look really close. If the middle eye sprouts and then is broken off the other two eyes will take over and sprout. If those sprouts are both broken off, they too have three sprouts per eye and will sprout. Each successive sprout gets smaller and smaller, until they are too small to grow. On a large healthy tuber, it should throw up at least 5 or 6 sprouts that will grow a nice plant. Small tubers may only have one sprout that is big enough. Those little bags of tuber clumps have very small tubers. Treat them carefully. Buy full sized tubers from USA sources if you worry about these things.

Keep the faith, Snuffles! We all break them, and they survive despite us somehow.

You might try rooting the broken sprouts in small pots with potting mix. Cover pot with a Baggie after watering well, and leave it alone for two weeks. If it is putting out new growth, remove the bag, continue growing in the pot for a few more weeks, then plant outside. Voila! New plant!

Thank you Cicivacation! Darn I threw them out already. I felt so bad when I did it. Poor things were trying so hard to grow!

I have only one dalia bulb and it's sprout is very smaller and broken..bulb have roots..is It will survive? Please help me.. Thank you