I've been trying to find a site which allows me to re-design my garden
- and can't find anything but sites that appear to have a layout for
this but are only trying to sell the services of landscape architects.

Does anybody know a site which would allow me to draw in our garden
and then try different things to see what fits?

Also, anybody have any tips about re-designing gardens for dog-owners?
I've got 2 and they have turned the whole thing into a gigantic mud
puddle dotted with bomb craters.

Thanks!