Welcome to YT! It's great to meet you and Nekko and Norie! You will love it here! So much wonderful advice and people who all have the love of our furbabies first in mind!
When we made a second addition to our furbabies Gizmo (my second yorkie but the only one at the time of getting Hershey our mini weenie) he wasn't ever really jealous but had already gotten used to being center of attention and getting spoiled...so when giving treats or putting food down, giving kisses or whatever we always give Gizmo first attention and then Hershey second so that Gizmo won't feel like Hershey came in and trying to steal his spot! Lol. It works with my furbabies and I have heard of others doing the same so you may wanna give it a try! Goodluck and nice to meet you!