So sorry this happened. You guys are having quite a week. I'm on my first and only greyhound. So I don't think I can give broad advice - but I do know what works for me. When I'm walking Maggie, she's in a martingale. I just don't feel in control with a harness. I adjust the collar to fit correctly every time I put it on her (which is only for walks). She only gets 6-12" of leash - because we're out for a walk, not a sniff and the martingale is always "engaged" on her neck(in the correct position with a bit of tension) We walk with purpose and direction - that I determine. You'll learn Miles signs that he needs to potty - and then you decide the spot. There is no way on God's green planet that Maggie could lunge/go for anything - food in the road, a bunny, etc. I am attentive to everything that's going on and coming towards us. And I need to walk this way because she has a high prey drive. And not to start on the alpha thing - but she knows I'm in charge. That has carry over into house life too. Hope any of this helps.