Hi, 2 20 min walks a day for such a dog is way too little. You will end up with an under exercised dog that can lead to destructive behaviour and other problems. The reason i asked all these questins is that these are two large dogs that require a lot of commitment. they both require regular brushing and exercise. if you could increase the walks to a min of two 45min-1 hr it would be way better.
if you are ready for the work and commitment of owning such a large dog, i would recommend a newfoundland although they are both good family dogs, givenproper care. Newfies are supposed to be great with kids and animals. but both are described as great with kids. may come down to personal preference. grooming and exercise needs are similar.
Monkey and Amy (cats)
“Dogs believe they are human. Cats believe they are God.”
"The average dog is a nicer person than the average person."