On Fri, 23 Jul 2010 09:28:29 +1000, "David Hare-Scott"
wrote:

EVP MAN wrote:
I need to install two pressure treated 4x4s in my yard that I plan to
hook a cable to as a dog run. This way he can safely chase rabbits
from my garden area. The posts are 10' long. My soil is mostly
clay. How deep should I dig the post holes for this length post?
Also, I plan to fill the holes with sacrete concrete mix. The bags
are 80 lb. each at the local hardware store. How many bags will I
need for each post? Any other tips or ideas about this installation
would be most helpful.

Thank You Rich from PA

I take it you will run a wire between the posts and the dog's lead will run
up and down the wire on a ring. Is that right?

I need more information.

So why are the posts 10' long? Why is this a starting point?
How high do you want to run the wire off the ground (often it would be on
the ground unless along a fence or wall)?
How big is the dog? (The bigger the dog the deeper the posts need to be
sunk)
How are you digging the holes? (The looser the hole the more concrete you
need)

David

Wooden posts should never be set in concrete... they won't be able to
dry so they will rot.

If you live where the ground freezes dig the post holes at least a
foot deeper than the frost line and fill with six inches of gravel.
Set the post and add another 6" worth of gravel, then back fill with
earth, tamping well and so that the earth is built up around the post
by 4" above grade. Concrete is used with metal posts, never with
wood. Nowadays a better choice is to use those composite posts made
from recyclables.