Ditto! My pooch is a Heinz 57 variety. We got him from a rescue centre so haven't got a clue what he is. He looks like a small German Shepheard, collie sized, but with longer softer fur. He works excellent for catching rabbits, is very well behaved, is very clever (sometimes too clever for his own boots) but most of all i don't think he's even been ill except for one time when i went on a canoe trip. 2 weeks of rain and plenty of dirty water made us both ill.
He'll follow me where ever i go, when i take him up the Brecon Beacons he'll take his own backpack and carry his own food and supplies, like hell will i carry them for him!
And before i forget to mention this dog is around 10-11 years of age. I'm sure eating a rabbit or 2 every week for his life has helped his health!