I am dog sitting 2 German shepherds atm whose owner said can't eat food before or after a walk because of problems to do with digestion. Is it a breed thing an age thing or combination of both? she told me I had to feed them at least an hour beforw their walk or an hour after it. They are 10 and 11 so she is probably being a little extra cautious. Do you think this is a little over cautious or do you think it is appropriate action? I have them for a week and my timetable does vary in regards to how many walks I have during the day and time generally. Do you think harm would come to them if i fed them before a walk?