This always happened to my dog when he was eating Nutro...I think it's quite normal for the second poop on a walk to be runny. BUT I think it's even better if your dog is only pooping once on a walk in the first place.
What is your dog eating???
When Chase was on Nutro he pooped up to 4 times per walk.....after we switched to Wellness and then to Orijen he started pooping only twice per day. Better food = less poop!
__________________
Chase (Friendly Resident Wigglebum) - Border Collie/Lab/Shepherd X
Kailey (Misunderstood Gentle Beauty) - GSD & foster failure #1
Rupert (Gold-Medal Winner of the 3 a.m. Kitty Destruction Olympics
)
Heidi - RIP my sweet baby girl