You were supposed to play catch with them but it didn’t fit your schedule. That walk you had intended was done by someone else. You ran out of the house without saying goodbye. Don’t worry your dog is too stupid to remember or maybe it’s brilliant instead. For how many grudges do we hold on others for the slightest error’s of judgement that lesson a great relationship. The dog has no ability to hold a grudge unless you truly stepped on it’s foot or similar violent acts. They may appear too stupid to remember but maybe their brilliance is they truly forget.