How to introduce new Shiba puppy to older dog for sleeping & play?

Keeping the new puppy by itself in the crate and slowly increasing his access as he is more reliable in the house is a good transition for both the new pup and your older dog. It is best to not crate them together as the crate can be an area of contention and a fight may break out with one or both pets unable to escape. Slow introductions of short, monitored, play sessions followed by breaks with the new puppy in a playpen or gated off area is a good way to get the two used to each other. If one or both dogs gets too stressed, separating them in different rooms or crates for a period of time until they've calmed down is best.