The Quest for the Perfect Dog

I know this is slightly unreasonable, but here's what I'd like to find:

A dog that is...

• more than a year old
• medium sized
• good with kids
• can handle being an only dog
• is able to keep warm outside in the winter (he/she will not come inside)
• will not kill chickens
• will run off rabbits & deer from my garden & worry the groundhogs
• can be off the leash & un-penned, but not run away

Bonus qualities:

• is easily (or already) trained
• likes to play fetch

We met this guy at the shelter yesterday and he seems like he has a great disposition... but I've read that Basset Hounds can be stubborn (not easily trained) and like to follow scents and then have a hard time finding their way home... That would be less than ideal. Further, this guy seems like more of a porch accessory than a fetcher. But you'd be hard pressed to find a sweeter porch accessory!

Now, I know labs are great family dogs too, but I'm worried about their "birding" instincts. And I know several chicken owners who, because labs train fairly easily, have trained their labs to leave their chickens alone.

So, the dog-searching adventure continues.