Each time you add a fur kid to your family, it's a bit more challanging till you get so used to it. I have three Yorkies and just adopted a 10 year old Papillon 3 months ago. We are adjusting to a fourth and with all the pre-op and post-op eye surgery. Traveling has never been a problem with them. I know that four is my limit for sure though. It's not as much work as having four kids, but the older I get the more I need to slow down some so I can enjoy them more. I guess what makes having multiple Yorkies a bit challanging is the grooming. (I groom them myself) Still, I'll aways have Yorkies in my life.