I agree with Nammie. For stuffing I use the selvages and similarly sized strips. I've never tried larger pieces, but I imagine Nammie's right about the bunching. By having smaller bits it will be easier to re-shape when it comes out of the dryer. I also overstuff the stuffed animals & floor pillows I make as they quickly start to flatten out after first wash. I've never made a pet bed, but I assume it's similar to a floor pillow & know the shelter by me asks for no wider than 1" strips.