Upon Shaggy's Osteopathic Vet, Dr. Kim Parker's recommendation, we got Shaggy a Help'Em Up harness from Blue Dog designs. Shaggy weighs roughly 70 LBS and a Medium fits his very well. Below is a picture of Shaggy with the new harness, which fits him very well.
The diagram below (courtesy of Blue Dog Designs), shows how the harness should be fitted on a dog and its fine features.
Working with an ailing animal, as many of us know, requires a lot of patience. Shaggy has taught me a lot, especially in the last few months.
If you know someone, who has a dog suffering from a similar problem, perhaps you could tell them about the Help'EmUp Harness. I do not profit in any way from promoting the product. It is simply that I want to help pet parents and pets who have Degenerative Myelopathy.