Chances are those were deer ticks. Just becase the dog has a lyme disease shot does not mean that they can’t get a tick born disease. I have 2 labs that have both had lyme’s disease shots every single year. They both have gotten a tick born disease over the years of hunting grouse. Keep an eye on the dog. If you notice the dog seems less active or it appears that the dog is stiff, get him to the vet ASAP. It is something that is treatable. My dog went from being normal one day, to the next day being stiff as if we had hunted hard, you could tell that it was painfull for him to get up when he was laying down. Then the next day he could not get up on his own. The second time around, I got the dog into the vet as soon as I noticed the lack of energy and the stiffness. The vet thought that I was nuts for bringing him in, but aster the tests were run, he had that tick disease again. Seems to me that the lyme’s shot will help, but does not stop it 100%.