At first glance the reaction could be one of endearment a cute little attention seeking trick.
Puppy rubbing belly on floor.
Then there is the submissive dog trying to crawl into your heart and body space.
A lot of dog owners are unaware these glands even exist probably because many animals don t have them.
The dog is off color or seems in pain.
A bloody or purulent discharge just beside the anus.
Dogs will often rub their bellies if there is an allergic reaction to a bug bite bee sting or other allergen grass dust etc.
Maybe something he ate.
Unfortunately some dog breeds especially cocker spaniels are prone to cancer of the anal sac.
Ideas to try like pepto bismo.
Watching a dog crawl along the ground while its tummy gets a good rub can send a variety of messages to dog lovers.
Anal sacs may become clogged or injured for a variety of reasons which can lead to scooting.
Cancer of the anal gland.
From previous experience with my dog i can tell he is in pain.
Most vets recommend 1 mg per lb of dog every 8 hours.
Thanks for your help.
If you suspect this you can probably use a little benadryl.
Scooting a bottom across the floor is a common dog behavior often indicative of an anal sac issue.
A tumor grows quietly often undetected until it blocks drainage from the sac.