Is rectal bleeding occasional or continuous in your dog? If it is off and on then only minor problems are expected. If rectal bleeding occurs during and after defecation then constipation can be the reason. Major cause of rectal bleeding in dogs are
- Rectal tumors
- Rectal fissures
- Rectal polyps
- Constipation
- Inflammation of colon
- Inflammation of rectum
- Anal and colon injuries