A few years ago my sister made this costume for her son. She use the Butterick 6695 pattern. It's been a hit in our family! A total of 3 nephews and my son have worn this costume over the years! My sister did an excellent job of sewing it together.
Here's a "quick" view of the tail from the back.
I sure love his puppy dog face paint to complete the costume!
Yes, you've found Waldo (puppy's dad)! More on that later. . .