Mending a hat

So, my puppy is cute. She is also evil. She managed to rip out part of the fur lining of my good winter hat. I’ve done some sewing with fabric but have no experience with fur or leather. Is there a specific kind of thread I should use to fix it?

You might need a larger needle. And if you have heavier thread try that. Buttonhole thread comes to mind. If you don’t have that I might be tempted to wax the thread. If you don’t have wax to use when sewing on buttons, just run the thread over a candle. This will strengthen the thread and make it slide easier.

You need a strong and sharp needle - an upholstery needle. Button and carpet thread is what I would use.