Golden not the same after long hike

Question
Blaze is a 13 month old Golden that lives in Arizona. Yesterday we went for a long hike (4-5 miles)and we stopped frequently for water breaks. Today Blaze has been very sluggish and appears to be favoring his hind legs. What do you think the problem is? This was the longest walk he has been on! Do you think he is just sore?

Answer
this also happend to my golden when she was almost a year old. if he doesn`t get over his leg in about a day or so u should have a vet check it out. yes he is just tierd. he will be back to his normal self in a day or so. (if not better then u should cut down on the long walks for a while of days)    *hope he feels better*

                                -madison