Thanks
I used a premie onsie, but I think I will go with the newborn sizer next time, so that I can make the top of the shirt longer.
How-to:
I first flipped the onsie over to the back side (the side without the design)
I then cut about an inch strip out (measure your dog to make sure that works for them)
I then trimmed off the bottom of the onsie and also cut out the part that would be underneath their body (the private area)
I trimmed it in a half moon shape, so I could retain the length of the shirt and so that they wouldn't pee on it.
At this point, I tried it on them to make sure the length on the private area worked.
I then sewed a the trim, so that the fabric wouldn't curl up.
After I trimmed around the edges of the fabric, I sewed the underneath part together.
And there you have it. lol. If you need more detailed pictures, let me know and I'll take an inside out picture of it.
Can't beat a cute shirt for only $2. lol