If you feed kibble, it is recommended (though I'm not totally sure why) to feed the kibble separate from the tripe or any other raw food thing you want to add to the diet.
My trainer friend and I make our own raw food, and it already smells bad, so by the time we add the tripe, our noses have already died from skinning the rabbits. When we started the transition to raw, we did start with the canned green tripe in a can from Pet Supermarket as a side, then slowly mixed in the raw and fed less kibble at dinner.
You shouldn't feed kibble and raw food in the same meal as they digest at different rates. Kibble takes around 16 hours and raw is around half that time (I think from memory) So it can mean runny poos if fed at the same time as part of the meal hasn't had time to full digest. This is why some people say a raw diet upset their dogs tum when they introduced raw, they just weren't introducing it the right way
We can just buy small frozen blocks or freeflow frozen tripe mince over here no tinned.