Concrete footing and fencing

[jslo]

If this is, kind of, a temporary solution I'd also consider slamming in a few T-posts.

[newracer]

A picture would really help.

[BigBear]

Are you concerned that the erosion will make a gap under the fence, or that the erosion will carry the whole fence down the hill?

I think my concern is that the erosion will carry the whole fence away if I don't mitigate somehow....

I'd probably pick out a 4 to 6" trench along the inside post line and bury the wire fencing straight down. Let erosion flow through

I'm worried that the erosion could eventually affect the house if not taken care of. I thought about terracing the yard and building retaining walls but that would be a huge project and super expensive.

If this is, kind of, a temporary solution I'd also consider slamming in a few T-posts.

I don't want it to be temporary, but it's kind of looking like that may be the best bet "for now".

If it is void of vegetation buy some erosion mat to put down.

Never heard of an erosion mat. I'll look it up, thanks.

A picture would really help.

Yeah...I'll try to figure out how to do that.