<human>: Can you summarize the given text in a few sentences?

Hello /r/dogs, my dad had a heart attack a while ago. He's quite overweight, decided to continue smoking and is physically not active at all - which also comes from other problems in knee and back. He has, however, a strong desire to get a dog. Which I completely approve of, for getting him out of the house to go against his depressive state, exercise and maybe even lose some weight.

He has wanted to get a Chow-Chow for a long time, but he'd be also open to getting a Labrador. What I read about Labs is great (kind, therapeutic, will to please, needs to be walked for 2*half an hour a day), and is my fav so far.

My google-research so far hasn't gotten me much, only that dogs might help to *prevent* heart diseases and that dogs can get them too. What I'm afraid of is that a dog might stress him out and higher my Dad's risk of getting another one. For he will only be able to go walk with the dog half to a whole hour a day in the beginning. Which is close regarding the Lab.

So my question is (also
<bot>: I guess), **do you have any information about dogs being suited for a life after a heart attack? And what about Chow-Chows and Labradors?**