I love Weimaraners, but boy can they dig. I lived next door to one in Indy for a number of years and he dug all along my fence line. What kind of fence do you have? They can easily jump those that aren't high enough. He was also a barker. I don't know if that's a breed trend, but it sure drove me nuts.
I haven't been a dog owner for a long time, but here are some questions that come to my mind. How healthy/aged are your cats? What care do you anticipate for them in the near or long term? Having gone through some geriatric feline issues over the last few years, I can say that cats can get pretty darn expensive as they age. If you got another pet, do you think you'd end up having to make different or compromised decisions for your cats because of financial constraints? How will that make you and your family feel? How much time do you have to devote to training a dog? Weims are like a lot of breeds in that they need consistent and effective training. Especially with a young child (and your child's playmates) to worry about, you'll likely have to devote time to training as a family. Are you willing to do that? Is DH?
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher