Likely two kittens and a puppy. I know that the felines don't respect fences and can live with that but the dog should not be allowed to get free, or dig under the fence.
I'm looking for your positive (and perhaps negative) results on what has, and has not, worked for you.
My thanks in advance
As a youngster Hooligan could leap tall buildings hedges in a single bound, so extreme measure were necessary.
There was already a wooden 'Hag' fence separating our property from the farm behind us, but no fencing on the other boundaries. The wooden fence wouldn't keep anything but a very dim cow in/out, so we used it as a support, running green wire diamond fencing along it. The green diamond wire disappears, from a distance all anyone really sees is the typical rural wooden fence.
We then built the same along the other sides of the property. At the front we built a more presentable closely-spaced wooden picket fence with lockable gate.
Then, because Hooligan came by her name honestly, we needed reinforcements. So along the fence we planted Brombeeren trellises and blueberry bushes on the sides with enough sun (in a small garden every centimeter needs to be used!), Thuja and climbing ivy on the sides where we needed a sight barrier.
And for good measure added a second fence, typical 'English garden' wooden picket hardscaping, in front of the border fence and hedge. With two fences sandwiching plantings, Hooligan couldn't get up enough of a head of steam to jump even if so tempted.
Then along came Heffalump. He is not an escape artist, but seriously clumsy and not too bright. One side of the property slopes, and he one day managed to get himself caught in between the fences and in his panic fell under a wire section of the fence after a rain eroded a bit of the slope. So back to the drawing board.
We used long metal U-shaped 'staples' from B/H to anchor the bottom of the green wire fence to the ground. Then added a stone border to prevent similar erosion. With your small pup, the greater danger is going under a fence, so this is where you should pay special attention.
So - Fence, hedge, fence. Because the plantings grow through the green wire you can't see it, keeping the neighbors happy.
Our fence posts are not installed in concrete. We are not allowed anything permanent, nor may we have solid fencing. But our 'impermanent' green diamond wire on a wooden fence does the job just as well, as the posts are set extra deep, while complying with building regs. OH is a good ol' Hoosier farm boy, he spent his youth fencing Grandpa's pastures, so building our fences was a doodle for him.
The borders have been secure for many years and many dogs. But now we have Robin Goodfellow, a mischievous sprite - or mayhap the devil incarnate. I'm waiting to see what surprises he might bring.
ETA:
Are your kittens and puppy new additions? How exciting! Here's to fun times ahead...
ETA:
The fencing materials (wooden posts, metal post holders, rolls of green diamond wire, hardware, etc.) were all bought from either Coop B/H, Hornbach, or Landi. Hornbach was the only place carrying old fashioned post-holers, which OH finds much easier to use.
Were it me, I'd add fencing either in front of or behind - or both - your existing hedges. No matter how thick the hedge, a determined pup could get through.
Also been thinking of a Scat Mat to put under the hedges. Attachment 138766
That doesn't look as bad as that. The spikes are pliable plastic. I'm thinking it would dissuade puppies and kittens at an early age.
To illustrate:
A dog I know was kept inside his garden via an electric fence. ( ) One day a wandering cat came into the garden. Dog started to chase, the cat went over the electric fence line. The dog, in chase mode, was pumped full of adrenaline and so ignored the beep warning and plowed through, getting shocked. The shock stopped him in his tracks... on the wrong side of the electric fence line. Once the adrenaline rush passed and the dog was back in thinking mode, he heard the warning beep, and remembered the shock... and could not bring himself to re-enter his garden.
Now, I know a scat mat is quite a different kind of aversive, but it is still an aversive.
If my dog gets out, I want to be able to call her back to me and have her respond ASAP. Certainly the time Hooligan took to flying, I needed her to obey my recall command automatically, as in the time it took me to climb over the fence myself she could have been in the next canton. Had she been afraid of crossing a barrier back into the garden there might not have been a happy ending.
Just something to keep in mind as you consider what kind of barriers to use.
Congrats on the new additions!
(Pics, pretty please?)