He cautions, "Now, by no means am I recommending that anyone run out and purchase these five dog breeds."
Although greyhounds are notoriously toothless, he advises interested people to give their pet extra dental attention.
Simpson-Vernon concedes that the long, lean greyhound "may not appear particularly cuddly," but that "on the whole.
Vet believes if he were to adopt a little dog, it should be a border terrier despite its dirty appearance.
Although their health is generally excellent, he says there are a few problems that might arise, so it's important to research the dog's lineage.
The medium-sized Hungarian wire-haired vizsla is on the veterinarian's approved breeds list, albeit not everyone is acquainted with it.
It's a "niche option," he says, "there aren't a lot of them around," but the few he's met have "wonderful temperaments."
He warns that unlike with a purebred, you can't always anticipate a mixed-breed dog's eventual size, temperament, or degree of activity.
A dog with a less inbred pedigree has a lower risk of developing hereditary disorders. According to him, that's crucial in his line of work as a veterinarian.
The ubiquitous labrador's inclusion on Simpson-list Vernon's comes as no surprise.
He explains, "They're great family dogs, and I simply believe that in general." They are kind, loving, devoted, and hilarious.