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Hi Jackie, Thanks for bringing this good topic. It’s important to stay up to date on the methods we are using and on the effect they are having on our dogs and their pet parents.
Here’s an article by AAHA that you might find interesting, which cites a few studies.
Zazie Todd has a similar take on the Portugal study and also cites another study about increasing a dog’s optimism.
Here’s an older article by Eileen Anderson which cites a number of older research studies that are worthy of notice.
Are these heading in the direction of what you were searching for?