[sushi_78]

Respiratory problems tend to result from dusty bedding, and any kind of bedding can be dusty. I find that dust levels in wood shavings vary a lot. Some brands are horribly dusty, and I don't feel comfortable using them, while others seem nearly dust free. It's important if you are buying pine or unspecified wood shavings that they are kiln-dried / heat treated / autoclaved, as they are unsafe otherwise. Unspecified wood shavings are usually pine, sometimes mixed with spruce.