It is true that injuries from chewing objects or toys can lead to bleeding dog gums or dental injuries. (petdentalservices.com)
Causes & Prevention of Periodontal Disease in Dogs: Veterinarian reviewed information that explains the causes of dog Gum Disease, including how it may be prevented. (petwave.com)
Normally dog gums are moist and shiny, but dehydrated dogs tend to have dry or tacky gums and are prone to have less saliva as well. (icleandogwash.com)