Oh, I'm so sorry you and your husband had to go through this, and for your loss of Theo. How devastating and sad for you to have to make this horrible decision. You did everything you could have to try and get him better, and in the end did the best thing you could for him, to alleviate his pain and suffering. It couldn't have been easy, I would have been heart broken. That breeder is just trying to place blame on you to absolve themselves of any guilt, or to admit there is a genetic problem in their bloodline. I'm sure if its genetic, then it probably isn't the first time this has happened to one of their puppies.