Very good idea to cut the cats claws, I was going to suggest that but seems you've already thought of it. Don't be surprised if your cat reacts differently to how you thought. I thought my cat would cope a lot better than he did, he'd been ok with a dog before but he flipped out a bit, took him a good 3-4 weeks to tolerate the dog and stop all the hissing and sideways fluffy tail poses. They're totally fine now and they're pretty good together but the dog still bugs the cat and the cat will get him into a headlock when he's had enough of being chewed on If you're going to see the pups before you get one I would suggest taking something with you to rub on the pup to get his scent so you can bring it home for the cat to check out and start to get used to. I found when introducing my two that the cat was a lot better when he was able to go anywhere in the house but the dog was confined to one room with a baby gate. That way the cat can observe from a distance and approach or not on her own terms when she's ready to investigate. Good luck! and just be patient, it will take a while for them to adjust.