Yes, we used it to look after dogs for about a year before getting our own dog, and it worked really well.
Let me know if you have specific questions about it. In my eyes, it’s ideal for both owners and borrowers.
We now use it to have people look after our dog.
To be very honest, we do view it as getting free daycare or evening care, rather than someone taking him for a quick walk every so often.
Ie, when we need someone to have him, it’s for at least 4 hours, if we’re going out for dinner, or a full day (or even over night). It’s very rare that it’s someone coming to collect him just to take him for a walk, so do bear that in mind.
The same was true when we looked after other peoples dogs - the dog would be with us for full days, whilst the owners were at work.
However, you can be very clear on your profile as to how much time you have available, and what you’d be happy to do.