I use them and like them.good info in the link above.
Yes it's easier to love a big ole dopey Lab, than a cat! I have two labs and 6 or so barn cats. One I can actually pet when I feed them. All have ther own personalities have to say my dogs are my favorite. I have a lot of room on the farm, room for all of them.
I have heard the seek deep holes or creeks/streams with warmer water. Incoming and deep entrances.