Im wanting to make a topairy that needs to be secure.
If by 'cement' you mean mortar mix (sand and cement) or concrete (sand, small gravel, and cement) then yes it should. Just cement, I believe, will be too soft and shrink away and the wet cement will swell the wood unless it is varnished or shellacked. It would be a good idea to drill a couple of holes and put large nails crosswise through the dowel or add a cross piece screwed in place to anchor the dowel - which tend to be smooth - in the concrete. If the result is to be put outside in all kinds of weather, then providing a drain so water does not collect and damage the wood would be a good idea.
