Compostable dog bags and plastic dog bags are two different types of waste disposal options for dog owners. Here are some key differences between them:

1. Material: Compostable dog bags are typically made from plant-based materials such as cornstarch or vegetable oils. These materials are biodegradable and can break down naturally in composting environments. On the other hand, plastic dog bags are made from petroleum-based materials like polyethylene, which are not biodegradable.
2. Environmental Impact: Compostable dog bags are designed to minimize environmental impact. Since they are made from renewable resources, they reduce the reliance on fossil fuels and produce fewer greenhouse gas emissions during production. Moreover, when composted correctly, they can contribute to nutrient-rich soil. Plastic dog bags, on the other hand, do not biodegrade and can persist in the environment for hundreds of years, contributing to pollution and harming wildlife.
3. Disposal Options: Compostable dog bags can be disposed of in a few ways. They can be placed in a compost bin if sufficient high heat is generated to kill pathogens found in dog waste, or taken to a commercial composting facility, if that facility accepts dog waste, where they will break down over time. Some compostable bags are also designed to be flushed down the toilet, although this may not be feasible in all locations. Plastic dog bags, on the other hand, should be disposed of in regular trash bins. 
4. Cost: Compostable dog bags are generally more expensive than plastic dog bags. The higher cost is often due to the use of more expensive materials and the additional manufacturing processes required. However, the price difference can vary depending on the brand and quantity purchased.

When considering which type of bag to use, it's important to weigh the environmental impact, convenience, and cost. Compostable dog bags offer a more sustainable option, but they may not be as widely available or convenient as plastic bags. Ultimately, choosing compostable bags can contribute to reducing plastic waste and supporting a more environmentally friendly approach to waste management.