Best Answer: My dog trainer advised me to wait after 30 minutes to feed your dog, You have to wait 30 mins before feeding your dog if hes been out for a walk You also have to wait 30 mins after feeding your dog before taking it out for a walk.Source(s): My Dog Trainer :). Anonymous · 2 years ago.Thumbs up.he biggest risk for things like bloat is feeding before exercise, I always wait a minimum of 1 hour after feeding before exercise. After exercise, I will feed him anything from 10 - 30 mins (depending on how vigorous the exercise was!) and never had an issue :). Sarah · 2 years ago.