Just a heads up for people who have dogs and are having back surgery. Before I went in for my surgery, I purchased a self watering dog bowl for my three dogs. Now, I'm home working and my husband is in the field all day. He fills the large Calgon style bottle and inserts it in the filler. My dogs (3) have clean water all day and I don't have to bend, can't, over to fill it. Husband feeds, etc while home, so the water is the only thing I worried about. It's just a good thing to think of if your spouse leaves for the day. They come in different sizes.