This is the InnoPet dog pushchair for larger dogs or several smaller dogs that converts into a cycle buggy too. Demonstrated with the help of Raisin a Rotweiler and something else cross who is a bit arthritic now and cannot do the long walks that he used to do. As you can see he seems quite comfortable in his new buggy.

The dimesions are width side to side including wheels is 80cm, height when the handle is up in the cycle buggy positon is 110cm, and depth front to back is 110cm.

https://innopet.nl/en/dogprams/innop...
To find out where you can buy this buggy in your country just do a search for Innopet Hercules. Don't forget to search for the cycle attachment if it is sold separately.

The bicycle bracket that fits on the rear bicycle hub came with the connecting tow bar for me but you need to check if it does for yours. https://innopet.nl/en/accessories/inn...

The connecting tow bar information. https://innopet.nl/en/accessories/inn...