I started with a kit from Carry Freedom. They have a range of bicycle trailers to tow everything including a canoe!
This is what the kit looked like in pieces. I bought a "flat bed" trailer, that will hold our dog crate.
Coming together....
Tools of the trade...
Trailer hooked up without dog carrier:
Putting the dog kennel on:
Dog kennel strapped to trailer:
Little guy in the trailer:
He looks happy...
A couple of test rides:
Post script:
It turns out that the factory provided straps plus bungee cords are not adequate to hold a 100 lb. dog in place. I drilled some holes and bolted the kennel to the pre-drilled holes on the trailer.