This DIY Halloween costume is perfect if you are tight on time and funds. It'll take less than an hour to make and cost just a few dollars in materials.
Measure around your dog's head and add 5". Cut the fleece to that length and 4-1/2" wide. To create the ties, fold the fleece in half lengthwise and trim the fabric equally from each side. Leave about 3-1/2" uncut from the edge of the fold (7" total when unfolded) at the full 4-1/2" width and then taper down to create 1"-wide ties as shown.
Optional: This costume looks funniest without ears, but if your dog has ears that stick up, or would be more comfortable with ear holes, simply try the head band on (right-side down) mark where their ears are, and cut slits.