Cindy's Answer

Since I can't see your dog while she does this or know what the hose material is made up I can't say whether you should allow it or not. I think I would probably replace the hose with something I know is suitable for a dog's teeth (like a jolly ball) I know some hoses are made of substances that may contain carcinogens and I wouldn't want my dog spending time chewing, biting or possibly ingesting particles of that.