Hey there welcome aboard! Sounds like the typical anal gland problem that dogs and cats run into! Most likely food related. Basically when they have a bowl movement the glands express naturally but sometimes they dont especially if there is a soft stool. Has your dog scooted? Not sure if you know what I mean?
Anyway some people can express the glands themselves after the vets show them but the smell is usually enough to make you change your mind. 
Considering the age of your pup! thats awesome by the way! I would think having the vet give the glands a one check over and express if needed wont hurt!  . It could also be other things like incontinence?? but since we are not vets here its good to just rule it out!
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"UNTIL ONE HAS LOVED AN ANIMAL, PART OF THEIR SOUL REMAINS UNAWAKENED"
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