They really like it, but I thought they would be doing better by now, especially the older dog (6 years old).
In what way are they not doing better? In what way are they doing bad?
I recently stumbled upon a website with a vet talking about a study she did with dogs on raw diets and high quality kibble and how the dogs on a raw diet, in the long term, didn't do as well as the others.
Is this one study done by one vet who is pushing a brand of kibble? Define a "high quality kibble". Which raw diet? How long is "long term". How does she determine "didn't do as well"?
She also talked about thyroid imbalance with a raw diet.
There is no thyroid imbalance with a prey model raw diet. My dogs have been on a raw diet for 7 years with no thyroid imbalance. I had thyroid checked in one of them about a year ago and it was completely normal.
So now I'm worried I'm making my dogs sick and am not sure what to do.
It's easy to read these websites that are pushing garbage and get scared. They use these tactics to get you to purchase their food. You can read web pages that will tell you you are killing your dog by feeding raw. Believe me, if that were the case, my dogs would be dead by now. They are both perfectly healthy.
I'm thinking about switching to a high-quality dry food. Any advice or suggestions?
There is no such thing as a high-quality dry food. It is all highly processed garbage from the human food processing plants. If the ingredients weren't used it dog food they would go to the dump.
Stop worrying. Think about it. Wolves have been eating a raw diet for millions of years. What do you think people fed dogs 100 years ago? 200 years ago? Kibble has only been around for a little over 50 years. Why don't you ask the dog food companies to prove their garbage won't kill your dogs. IMO it does.