Values are from USDA Standard Reference 22 and are based on edible portions of mature seeds, cooked, boiled, without salt. (academic.oup.com)
Avocados are considered to be a good source of dietary fiber (6.8 g fiber / 100 g edible portion)(12); 72 % of these are insoluble fibers (i.e., cellulose, pectins, and hemicellulose)(14). (academic.oup.com)
But you should always stick with the fleshy edible portion and get rid of the seeds, although it's perfectly okay if your mutt happens to be a large breed. (mypetneedsthat.com)