I ended up with my Jack Russell in a similar situation to yours, it sounds like. She belonged to a neighbor who couldn't keep her anymore, and she was such a sweet dog- the neighbor ended up giving us to her. It was only after we got her, and started having issues with her health-wise, that I looked further into where she came from, etc. Looking up information about the breeder, I found that (at best) she came from a byb, and at worst, the kennel seemed to me like it had all the makings of a puppy mill.
Dixie, who is now 11, has had problems with epilepsy, low thyroid, mild-moderate hip dysplasia, cataracts, and is starting to have arthritis issues as well. So far, she has made it over three years past what the vet said my "best case scenario" was for her life expectancy, and she is still going strong, considering all the issues she has had. She loves life, likes all people, enjoys going with me on car rides to the barn, and loves to swim.
She's also the reason why I have been researching poodles for several years now, and why I will only get a puppy from a breeder who is well-recommended, tests, and breeds to improve the breed.
As far as Cavaliers go- when I was a little girl, I did quite a bit of research on the breed, as I thought they were exactly everything that my family needed in a dog- at that time, they were a relatively unknown breed (this was about 11-12 years ago). They still had health issues, but they didn't seem to be as prevalent as they are now. I still feel that, with enough research, it would be possible to find a good, quality breeder who is actively working to improve the breed (and get rid of the health problems that are so prevalent).
The biggest problem that I've read about with Cavs is their heart issues- like tina mentioned, I've read the same statistics about the heart problems.
I'm sorry I don't have anything specific to offer- hopefully things will start to go better with your little guy!
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