I took the boys for what I thought was an easy walk at the park yesterday, but after we got home Jack was miserable and uncomfortable, and just laid on the floor quivering for a while. He recovered and was normal this morning, though a bit subdued. He still wanted to play tug with Barclay out in the yard, and now they are all crashed for a nap. I was really worried about him last night. I think maybe he just got a bit too much of a workout. I forget that he does have a lot of weight to work off, and since he plays so hard with Barclay, he seems like he’s in good shape. So today I’m going to just let him rest and next week we’ll visit the vet for a checkup.