Reddit mentions of Regalo Easy Step Extra Tall Walk Thru Baby Gate, Includes 4-Inch Extension Kit, 4 Pack of Pressure Mount Kit and 4 Pack Wall Cups and Mounting Kit

Believe me, you're in for a bit of a challenge in the playing regard. It's pretty important to not let them play at all initially.

/u/AnalgesicSex explained it very well above, but basically they are taking the knee apart, grinding/cutting away in there, and trying to put it back together better than before. It's pretty fragile until the muscle grows back, so if you're not able to keep them calm, our vet(s) recommended crate rest only for a few weeks. In our case, we bought this (extra tall, he's a lab) baby gate and put it on the door to our office. I basically kept him in here with me every possible waking hour, and put him in the crate when I couldn't directly supervise. It wasn't much fun for him, but the dogs all got used to it very quickly.

Surprisingly enough, neither! We got a dog with a totally shaved leg (it looks hilarious) and some gruesome nasty crusty staples covering the raw incision. I was pretty surprised myself, but they said it was better to let it air out. They did provide us with a cone of shame (Elizabethan collar), but we didn't need it after the first day. We were also on an antibiotic for 10 days. As always, YMMV with that stuff, and I'm sure the vet will do whatever is best for your pup. Our main concern was to go above and beyond all the instructions to ensure the recovery went well.

We have a Regalo Easy Step Extra Tall Walk Thru Gate. It's too high for the cats to jump and for the toddler to climb. The toddler can open it if it's unlocked but that's not an issue for us given where we use it.

Edit: This probably won't help you. I misunderstood your cat-restraining needs. We need to keep our cats out of where the gate goes. You want yours to be able to jump it.

I hunted around for something similar for a long time and finally found this. It's listed as a baby gate but stands 41 inches tall. It's worked very well for me, neither of my cats (one seven pound, one thirteen pound cat) has attempted to jump over it yet. (I've had it since June)

What about one of the accordion style closet doors? Will take up much less space in your kitchen when you open it (or even enough to still open into the laundry room?)

There are also vinyl ones that fold up much tighter, but they usually look kinda cheap.

They do make taller baby gates that are about waist high (here for example), but still might not be tall enough for you.

I have a 50lb <1y/o mutt, a rather pissy big old cat, and a tiny grumpy old man bunny. The dog chases both of them, but he chases everything (leaves, bugs, birds, anything that moves). Cat holds her own, so pup will chase her if she runs down the hall, but backs away as soon as she stops. And when he "gets" the bunny, he just stands over him. I'm still cautious (bunny basically lives under the bed & has escape routes) and I keep the dog separated from the rabbit when we're not home, but I've been happy to see that they get along well.

But I do want to caution you on what type of gates to get if you go this route for extra security: my mutt was like a rock climber, he scaled or pushed his way under the baby gate. We finally got rid of the old one & picked up one of the ones that's primarily vertical bars so he couldn't climb it. It's been amazing.
https://smile.amazon.com/Regalo-Easy-Step-Extra-White/dp/B001OC5UNA/ref=sr_1_9_s_it?s=baby-products&ie=UTF8&qid=1500641106&sr=1-9&keywords=baby+gate

I hope they end up getting along beautifully, but if he's a chaser like mine, always keep escape routes/areas and separate areas of the house for them. If he ever seems like he's making an effort to actually get the cats & hurt them, seriously consider rehoming them. It sucks, but as said before, having a dog that's killed another pet is just awful.

Ended up ordering this!

Regalo Easy Step Extra Tall Walk Thru Gate, Bonus Kit, Includes 6-Inch Extension Kit... https://www.amazon.com/dp/B001OC5UNA/ref=cm_sw_r_sms_c_api_daqTBbWSVV65G

>> but this requires confidence that you will never, ever leave the nursery door open; never, ever turn your back on the baby when your partner comes in the door to ask a question.

Just get a self-closing baby gate. The extra tall ones are nearly cat and dog-proof (I use a 42 inch gate to keep my cats from getting into my sewing workshop when I'm not home) and the door can still be closed with the gate in place for added security. A $40 gate can keep pets and babies separated until you're 100% sure that the pet is appropriately socialized.

Well-socialized pets generally aren't going to seek out a baby to attack (the idea of cats getting "jealous" and attacking a baby is pure myth). It's much easier for a cat to get into a crib than out of a crib, though, and a cat who finds itself trapped in an enclosed space with an unfamiliar animal is likely to panic. So it's a good idea to keep cat and baby separated until the baby is past the crib stage. Cats aren't as trainable as dogs, but they're really not that hard to train if you keep natural cat behavior in mind.

I'm sure there are rare cases of exceptionally violent animals who can't be kept in a house with children at all, but a responsible owner will explore behavioral therapy and other options before giving up the pet.

Go get a baby gate with a proper gate on them. They're relatively inexpensive. I suggest getting the tall ones so the cats can't jump over it

Now, the cats can just walk through the bars, so to prevent that in my house I bought a sheet of fiberboard (it's in the same section as the peg board at hardware stores) and cut it to size, then I drilled some holes and zip tied it to the baby gate. In my case I turned it into a chalk board for my daughter, but it keeps my ferret & cat out of the hallway.

Even an extra tall gate? We have this one from Amazon. It's delightful because it's a walk through door which you don't need to drill into the wall, but it's extra tall so my 2 year old can't climb over it!

I highly recommend the Regalo Easy Step Extra Tall Walk Thru Gate. Toddler went be able to open it, and you don't have to climb over it.

These are the gates I use in my house, they work very well and are tall enough so the dog cannot jump over and the vertical bars do not allow climbing.

Bought these recently for my new Shepard mix.

https://www.amazon.com/gp/product/B001OC5UNA/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Get a baby gate for her door, or at the top of the stairs, whatever works best for your floor plan and where you want her to be. We have one of these in the door:
https://www.amazon.com/gp/product/B001OC5UNA

I found a tall gate that worked well for us: https://www.amazon.com/Regalo-Easy-Step-Extra-White/dp/B001OC5UNA/ref=sr_1_3_a_it?ie=UTF8&qid=1522192719&sr=8-3&keywords=tall+baby+gate

Or if she is not a crawler, you can get one of the frame mounted ones and just mount it a little higher. That's what I've done for my current dog since he doesn't like crawling.

I agree, baby gates are likely your best tool so you can ensure the dog can't get to the son without your knowledge and supervision. They have ones with doors in them so you don't have to constantly climb over them.

This is the one I use https://www.amazon.com/dp/B001OC5UNA/ref=cm_sw_r_cp_apa_i_j8plDbG1JKBZN