He can be headstrong, protective and snappish. This breed needs thorough, firm training. Sources differ on the breed's combativeness with other dogs. Ask your breeder about this characteristic in specific lines. Manchester Terriers should not be trusted with other animals and must be introduced to children as a young pup.
Some lines are prone to a blood problem called glaucoma.
Also some are prone to a bleeding disorder called Von Willebrand's disease, but this is rare and wounds heal quickly. If left out in the sun for long periods, heat bumps may appear along its back. The Manchester Terrier is a good dog for apartment living. They are very active indoors and will do okay without a yard. Manchester Terriers prefer warm climates.