you mean fresh made ones or bought, ??
4 of my buns now turn their noses up at shop bought willow, and seeing how weeping willow dries its a totaly differant colour and doesnt have the glazed look the shop ones have,
I try to only give the softer newer shoots for them to chew as well, I do get older shoots , but I no longer give the tougher pieces to frosty due to her jaw alighnment
if anything fresh willow makes my buns poos huuge and golden, so no gut probs here