First its not really a Dogsbody it but should be correctly called a Welsh Terrier. Just thought I would point that out ,Or someone will

I find the correct method of tying is very important with reverse tied dry flies so I will do my best.
Up eye if you have them sizes 12 to 18
Thread black
Start the thread a little way after the eye run the thread to the bend, tie in a white or badger hackle (the shiny side of the hackle should be facing you before you start to wrap.This makes the natural curve of the hackle slopes away from the hook body.
Wrap the hackle nice and tight together. Wrap the thread around the butt to force the hackle in a backwards slope
Next tie a natural red game hackle. You must also wrap this tight up to the first hackle.
Again the hackle should be tied in with the shiny side facing you. So the curve of the fibres is backwards.
Wrap the thread tight around the butt again forcing the hackle backwards away from the hook.
This is my body material its available from most sewing shops.
If you have trouble getting this you can use anything which is a camel colour.The material you use is not really important but the correct colour is a must. I use one single strand from the twist to wrap a body.
Now time to test the fly.
Simply throw the fly onto a hard surface (the table top).
If it lands like this the hackle is to long. You must trim the hackle
Yes you read correctly trim all around the circumference of the fly
Regardless of what some tell you trimming the hackle with moderation does not distroy the floatablity of a hackle in fact it improves it.
You are increasing the contact area of the hackle to the water surface by removing the sharp hackle points.
Next test again.
It needs to land on the surface like this supported by the hackle but sitting on the eye of the hook.
This is perfect, Try some
Gary (nicho)
Bamboo rod maker.