Devon is writing a report about keeping dogs happy and healthy. he will collect information about dogs' health from many different sources. one will be an interview with a dog walker. the dog walker would not be the correct source to answer which of these questions?

a) why is exercise important for dogs?
b) what types of exercise do dogs most enjoy?
c) what type of dog food has the best nutrition for dogs?
d) where should dog owners take their dogs to give them exercise?