We dont have house dogs but even we did I never left the food down. I would feed at the same time every day and when we had multiple dogs they were fed seperate or in their respective kennels. After 20 minutes the bowls were taken up. They werent fed again until the next day same time.
The dogs we have now, Gracie is getting 6 cups while she is pregnant and she eats that in about 5 minutes so 20 minutes is plenty of time.
"Life is like a grindstone. Whether it grinds you down or polishes you up depends on what you are made of."
But a Constitution of Government once changed from Freedom, can never be restored. Liberty, once lost, is lost forever. John Adams