Every so often I will purchase Hartz Oinkies Smoked Pig Skin Twists for my dog and she spends about an hour nibbling away at them. These treats are tough, but don't do any damage to her teeth. They actually do a good job of keeping them clean and strong. These treats are about 5 inches long and I thought initially these could be dangerous if my dog runs into an object by accident with it in her mouth like a cigar, but luckily she holds them horizontally. The only down side I noticed with these treats is that if I give my dog more than two in a week her gums will start to bleed a little. Even though her veterinarian said this was normal and actually helps build jaw strength, I try to keep this treat to a minimum. Because I dish these twists out at a low rate a pack of 25 can last my dog for several months. I will continue to buy Hartz Oinkies for my dog as a way to get some quality chewing to help maintain her healthy teeth.