Trixie Timon rucksack.

We used a 50p foam offcut to make it a little shallower for our (short-legged) JRT.

Can anyone recommend a back pack I can use for my JR terrier. He is now 13 years old and over the past 18 months I have greatly reduced his mileage, and if I want to do any long walks then I have to leave him behind. I wish to include him still since I am on a mission to complete my Nuttalls next year. I have tried adapting some of my old packs, but doesn't work. There are several on Amazon and various prices.
What I don't want is a front carrier with holes for his legs and tail, nor do I want a pram, which you can actually buy. Can't see myself somehow out on the cells with a dog in a buggy......Got an image to keep!!!! He is a Parson and weighs about 7 kg. Any idea greatly appreciated before I buy one.