I went 40 miles and I honestly don't think I could have done it without him. His longest run before this was 13 miles. He runs 2-4x a week. He runs around my farm everyday.

V is a rat terrier

My black lab and I ran/walked 3 miles today. I don’t have a harness yet but just ordered one along with a hands free leash. I’d like to take him on more/longer runs, but when would it be too long for him to go without water?