Ian use to walk around our sub-division twice, but lately we noticed that he will barely make one complete circle. He had a physical two weeks ago, and all was well. He also had blood work done because he had his dental the following week. Maybe it's because of the pollen, idk. We walk him in the mornings, and in the evenings after 6 when it's not as hot. He walks mostly on the grass so his feet won't get hot. He is very active in the house, and gets a lot of exercise running up and down the stairs. He's eating, drinking, potty-ing, and pooping as normal. Should I be concerned?