The lab/chow mix is designed to make a chow more mellow. Chows where used as Guard dogs in China and they are very territorial and dominant. They bond with one owner and are not the friendliest to other people. Many vets require chows to be muzzled when they check them out because they bite.
Chows are also very aggressive with other dogs and will take on larger dogs and do quite well because of just how aggressive they are. They have the same biting strength as a pit bull.
But, being part Lab it may be that it is more mellow and less aggressive, like labs.
Just so you know, I have had two full Chows and they kill most anything that gets in the yard, particularly cats. They have killed cats, rats, squirrels, possums, birds, etc. Anything in their space is pray.
So you are taking a risk if you get this dog while having a cat. But, they could get along fine or the Chow could take the cat out in about 2 minutes.