5. Brush those teeth. Dental hygiene is an often overlooked part of pet care. Many of us simply forget to brush our dogs' teeth on a regular basis. Unfortunately, poor oral hygiene can lead to plaque, gingivitis, and eventually periodontal disease, a bacterial infection of the mouth that has been linked to heart disease and organ damage in dogs. Fortunately, it's not hard to keep your dog's teeth in shape. Simply brush their teeth regularly, provide safe chew toys and dental treats, and have the vet check their teeth at annual visits.