How do I make a sewing pattern for a stuffed animal into a larger pattern for a larger stuffed animal?

The horse may be 3-D when finished -but the pattern itself is still flat and pieces that comprise the horse are 2-D and they can be scaled up in the way all 2-D patterns and shapes are enlarged. The first method is by using a photocopier with an enlarge feature, scan each piece, enlarge the percentage that you need and you will have a pattern the size you want. If that's not feasible then use the tried and true grid method that been used for centuries by craftspeople all over the world. Draw a grid on each pattern piece -or draw a grid on transparent plastic sheet and place it over the pattern piece. You can buy transparent sheets at craft stores. Next draw a grid on a sheet of blank paper that's sufficiently larger than the grid on the pattern. Now transfer the old piece to the new larger grid. Here's how it's done: http://weefolkart.com/content/reducing-and-enlarging-patterns-aka-thinking-outside-block Here's a simple explanation PDF: http://www.dollstreetdreamers.com/back_alley_articles/enlarging_patterns.pdf here's a video demonstration: http://www.youtube.com/watch?v=5zVm43eZDrI http://www.wikihow.com/Enlarge-a-Square-Grid-Sewing-Pattern-from-a-Book Using this method you can make your horse life sized, kid sized, or giant sized, depending on the size of your grid. It been used by tailors and dressmakers for centuries and it will work for your horse pattern.

A pattern can be made slightly bigger by an inexperienced sewer but to make it much bigger requires a knowledge of pattern drafting. It isn't just a matter of scaling up. The proportions of an bigger horse are different to those of a smaller horse. For example the legs may be twice as long but the head wouldn't be twice as big. To explain what I mean imagine 2 ladies the same height but one is very fat and the other is very slim. They would obviously take a different dress size. However some measurements wouldn't change very much. Their wrist,ankle and neck size would remain the same, no matter how much weight they gained.