Yes; because of the zipper, it will be easy to replace stuffing. Just unzip it and take out the old stuffing, replace with new stuffing and zip it back up.
Place your teddy bear inside a mesh bag and toss it in the washer. Use 1 tbsp of laundry detergent and distilled white vinegar for the rinse cycle to deodorize...
Practice! Look up other tutorials if you're having trouble following this one. Either way, try drawing a teddy bear every day for a month and see how much you improve....
Yes, you can install a regular zipper with a normal foot. However, if you want to master invisible zippers (and do other things like sewing on lace and sewing over...
Wet tail is one possibility, although from what you write, this sounds more like settling-in problems. Your hamster has had a major change in the past 24 hours, and this...