Oooh, just found it HERE on Ebay. It is $25 though. I hate how they jack up the prices for OOP patterns, but what can you do? They have 3 of them available at this time though. They may sell out quick. This seems to be a popular one.
SEWING PATTERN Simplicity 3925 Dog Clothes DRESSES COLLARS BLANKET BED & TOTE (039363302988) | eBay
I also have these patterns that have carriers on them that I thought would be good to try. You could try your hand at one of these if you don't want to pay that much for an OOP pattern. Or keep searching for the pattern. I haven't checked Artfire, but it may be on there too.
BUTTERICK 4696 Misses' and Dog Accessories Pattern | eBay Kwik Sew Pet Jacket, Dress and Carrier Pattern - Discount Designer Fabric - Fabric.com