Hello,
For cases like this I usually recommend the following.
Ask about diet. See if anything could be influencing water intake. I do a very thorough exam. This includes anal glands. Then I repeat the blood work a few months later (if not drinking or peeing excessively). If the pet is believed to be drinking and urinating more then I think that X-rays, abdominal ultrasound (by a proficient vet) and LDDT are warranted. I don’t have too much preference on order because they usually all need to be done. The biggest thing to talk about before starting all of these diagnostics is that the client must be willing and able to treat for cushings before we start the expensive procedure of diagnostics.
Good luck
This happened to my dog many times with the same result. They have always been fine. Of course I don’t know what kind of frog this was, or your pet’s medical history or condition, so please keep an eye on your pup and call your vet with any questions or concerns