Our golden is almost a year old now and 3 days ago suddenly started refusing to go into her crate — at all! For a while we had her trained so that she would go in on command, then we'd give her a treat, but suddenly she wouldn't go in or she'd go in after a long, long time and bulldoze out while we were trying to close the door. We can't force her in because she is too strong and gets snappy (something we don't want to reinforce). Any tips? Anyone else had this problem? Why would she do this suddenly?