Well, we have completed four days of Clavamox with minimal improvement if any at all. Called the vet to ask him some more questions and he said he is bothered that Diego isn't getting better. I also told him that when I got Diego he was covered with ticks. He said a tick borne disease is certainly possible but usually they present with different symptoms.
Vet wants to run another CBC (complete blood count) just a week later to see if the levels have changed. There was nothing alarming about the first one; just a slight indication of a chronic infection, which is why he's at the vet in the first place.
I asked the head vet where I work (very smart, very experienced, but large animal) what he thought about it, and he said as long as Diego is eating and gaining weight and still acting normal, it's probably not anything to be concerned about, and another CBC so soon is probably not necessary. He said some dogs catch things that take four weeks to go away.
One vet is concerned, one vet is not. Pulling my hair out over this.