We fed Alfie chicken, rice and pumpkin post surgery in that area. He wolfed it down. I saw lots of advice that said a spoonful in a mix of lots of chicken and some rice...we probably gave him much more than that.
We live in Australia, so pumpkin is very common all year round, we just boiled it from fresh (remove the seeds and skin - both are edible for humans, not so sure about dogs.) chop it up and then boil until soft...imagine boiling potatoes until they are probably softer than you meant. It will be gently crushable and moist. We then mixed about as much pumpkin as you can hold in both hands with 2-3 boiled chicken breasts that we shredded. We mixed in a cup (measured dry) of boiled rice (boiled in the water the chicken was boiled in to give it some flavour.) no salt or other seasoning.
The mix was probably more pumpkin than most recommend but our boy wolfed it down and had no major dramas with pooing, other than it took about 4 days to start...the vet said that was normal, but once he started he had no problem. The more pumpkin, the more orange it might look coming out the other end...this is normal.
If you are using tinned pumpkin make sure it isn’t the pie version with added sugar, etc. you read about that online, I think it’s popular in America. In Australia, pumpkin is available year round so always used fresh. if you can get your hands on fresh pumpkin, just cook it like potato. Any pumpkin variety is fine.