As I was trying to say, no my dog is not defective. She walks in to walls because she isn't paying attention to where she is going. Not because of genetics. She isn't stumbling around. Just not using what little brain she has. She couldn't get over the thing in the room because she was confused. Not genetics again. She is fully capable of walking over the pillow on the floor. She just isn't smart enough to figure out what to do. That is another reason why I am antibreeder 99% of the time. Oh, it's your dogs lines. They are bad lines. Genetic defect. NOPE. Sorry, but not every fault is genetic. As I said before, Tess, the demodectic dog was purchased from outside lines. My stepmom has no demodex in her lines. She also only breeds normal eyed dogs. Just because your wonderful lines don't have the problem, doesn't mean that it doesn't exist. The OP asked about the breed. I merely stated somethings that can occur. I never said, Hi my name is roxy and all the collies I ever knew had THESE problems." Don't get me wrong, I no longer am in touch with my stepmom because of her breeding. She moved her dogs to outdoor kennels and I disagree with that. Breeder arrogance turns me off from breeders 100%. I will NEVER own a dog that I purchased again. I will always rescue. So, if I get collies with demodex, eye problems, hip problems and stupidity issues, then so be it. Some collies are intelligent. My Piper was insanely intelligent. But, even though some might mistake Faith's intuition as intelligence, she is not. Her mother was. Her sister was not. Her neice was. It's not the lines, but the dogs. I might not agree with my stepmom breeding, but I rarely agree with anyone breeding. so, before you tell me that my dog is defective, please get the facts straight.