Answer: Yes you can absolutely do that! Click on the link below for a full answer from "The Dog Blog" on Wordpress! :-)
I recommend a dog crate that is somewhere around 35 inches wide, 22 inches deep, and 24 inches tall. That is the size of my personal dog crate and it would easily accommodate two-three cockapoos comfortably. It would be fine to get a smaller crate, certainly, for a single dog. I posted photos of my crate at the link above. There are photos showing the crate empty and with two adult dogs inside so you can get an idea of the size.