On the plus side the vet gave Bob a good physical exam and couldn't find anything, the blood tests didn't show any pointers either. One of the results was slightly higher than normal and another was slightly lower but all in all they were normal to good results for a dog of Bob's age.

On the minus side he has lost around six pounds in weight and is visibly thin.

While I was waiting for the vet to call me with the blood test results I checked and discovered what could be a timing and ingredient connection between his weight loss and what I have been feeding him on.

Talking it over with the vet we decided on a course of action. I'm going to change his food back to what I was feeding him before his weight loss plus give him extra in an effort to feed him up. After a month I'll take him back to be weighed and if he has either not gained any or even stayed the same then he'll go for scans and whatever else is necessary.