Hello. I was just about to suggest canned pumpkin when I saw that @Floki
had posted about it, too. I use it all the time with my three dogs, one being a blue heeler mix. It is great for all kinds of stomach/pooping issues. Also if I think one of my dogs ingested something bad , I grab the canned pumpkin and give them a few spoonfuls of it. The high fiber can help make the foreign item pass if it is not too big.
***Use only canned pumpkin with NO ADDED SUGAR. I find it at my local grocery store on the baking aisle for 79 cents a can.
I mix it into my dog's bowls with their regular meals. If I have to give extra portion, I generally put some chicken broth or cooked meat juice mixed in to help with the taste/smell.
Sometimes dogs can get constipation if they aren't drinking enough at times. If your dog isn't drinking enough, to avoid dehydration, you could boil some chicken with water and then give your dog the broth from that. We make chicken like this often and then I pour the broth into ice cube trays and freeze, then put the cubes in ziploc bags for later use. And the chicken we cube up into small bites for training treats and freeze as well. Convenient, cheap, and healthy! And they love it!
My blue heeler mix, Gracie, tends to get constipation type problems from time to time, generally during or after experiencing stress. So if she is under stress from say, a stormy weather week, as a preventative measure I mix in some pumpkin with her food...just in case...
Also, I noticed with my dogs, certain chewies or hard bones, etc can change their poop and make it harder or give them constipation. Makes their poop look kinda white or light tan colored. Ok, TMI, sorry. I just remember it scared me the first time I saw it.
Best to your dog!