You can fill the Doggytube with soft pastes, creams, or semi-solid wet food. Here are some suitable fillings:
Dog pastes: There are special dog pastes available in various flavors that are suitable for the Doggytube. These pastes are soft and tasty.
Dog creams: Dog creams are also a good choice. They are soft, easy to dispense, and often come in various flavors.
Semi-solid wet food: You can fill semi-solid wet food in the Doggytube, especially if it's creamy or finely chopped. Ensure it's not too firm so that it can flow easily through the tube.
Homemade creations: You can also make your own treat mixtures as long as they have the right consistency. For example, homemade liver sausage mixtures or yogurt with pureed fruits.
Make sure the consistency of the filling is not too runny or too firm to avoid blockages in the Doggytube. Use treats that are safe for dogs and match your dog's individual preferences. Experiment a bit to find out what your dog likes best.