Fleece blankets/material (Bryn-y-cochin SY12)

My wife is making dog toys (see photo) to sell in aid of an animal rescue charity. They're made by knotting strips of fleece material like blankets, and we're getting through our stock really quickly! If anyone has any spare old fleece blankets or similar (at least one dimension needs to be longer than 5-6ft/150-180cm) then please let me know. Thanks! Phil.