I have 3 gps in a double hutch. During the Spring & Summer I put the old hay/wood shavings into the compost bin after I've cleaned the hutch. However at this time of year the compost bin activity starts to slow right down and I can't fit the hay in - I clean them out twice a week so there's quite a lot.
What do you do with it? I end up putting it into carrier bags and throwing in the bin. The trouble with that is we have fortnightly wheelie bin collections and my dustbin gets full up with hay!
There is a garden waste collection which you have to pay for, but that says no pet waste or sawdust.