There are so many cultivars of dogwood, it would be quite difficult to find the exact one from that particular picture. If you google flowering dogwood, you will find a wide variety of available types. Cloud 9 is what my grandmother has in her yard in Mississippi and it looks like that picture, but it's really hard to tell since it mostly just shows one branch and only one season of the tree (their leaves mostly go a beautiful red during the fall). Dogwoods are widely available at tree nurseries, at least in the southeast where they grow everywhere. As others have said, they like it wet so Vegas might prove a challenging environment, but I know there are several shrub/bush types that can be grown in containers (I've even seen semi-bonsai versions). I'm hoping to have some on our land here in Texas soon, which is pretty dry as well (though not Vegas dry). They usually bloom around easter and are quite beautiful throughout the year. Good luck!
