Roundup is certainly one of the most widely used weed killers but there have been some recent studies that show it has some significant health risks.
I used to use it myself in some areas but I never used it around the vegetable garden or near the dogs as I never fully trust a huge marketing company.
It is only common sense to consider that what kills weeds so efficiently can also be potentially harmful to people and animals.
A few articles worth reading --
http://articles.mercola.com/sites/ar...herbicide.aspx
http://rt.com/op-edge/154000-toxic-h...-gmo-monsanto/
http://sustainablepulse.com/2014/07/.../#.VPZMVuFUUZg
And a more technical article --
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3955666/
I would not use Roundup near my home, nor near my dogs. I am hearing a fair amount about bitches not getting pregnant when bred and I have to wonder how much of that is due to all the chemicals in our lives.
So be aware of this and use caution with Roundup.