Be very careful with some of the advice you have been given!
1. Meat Tenderizer - is very high in salt. Some dogs are very sensitive to such a change in their diet & will have increased thirst/urination. I know someone whose dog couldn't hold their urine 30 minutes because they were drinking so much due to the additive. I recommend against it.
2. Coprophagia tablets - I tried this once. That was enough to find out that some dogs are sensitive to the ingredients in it, & after cleaning up liquid poop accidents for 3 days inside my house, decided a dog that ate poop wasn't the worst thing in the world.
3. Pumpkin/pineapple - safe remedies. The key here is a spoonful, not a ton, added to the meals. Works for some, doesn't work for others. Make sure it is pure pumpkin, NOT pumpkin pie filling.
4. Diet change - I had some moderate success switching to a more naturally based kibble (was feeding Pedigree, switched to Nutro/Fromms). Theory behind that is the dog is able to more completely digest what they eat, & therefore what comes out is less appealing.
5. BEST option - clean it up immediately. I open the door, tell my dogs to "go now", watch them poop, bring them back in & then go out for the 30seconds to pick it up. If you can't do that immediately, at least you saw where your dog went, & can go get it when you have a chance. Bring your dog in when he is done pooping.
6. A kennel/designated area for pooping is fine, provided you are putting your dog in it to poop & then removing him from it once he is done. Otherwise, you are just giving him enclosed access to his poop. This still needs to be cleaned on a regular basis (every time or every day)
Finally, most people notice dogs increasing their interest in poop during the winter. Two theories behind this - #1 poop-sicles are something dogs can really sink their teeth into. #2 in cold weather, the aroma is stronger & catches the dogs interest more.
Best of luck. Many people have dogs with this habit & are never able to break it. Truly, best bet is to find a way to pick it up immediately.
T. - Breeder of Rhodesian Ridgebacks since 2000