Leave it command

My dog is OBSESSED with people, dogs, and my cats. I've only had one other dog and he didn't really care about other people or cats. I honestly never had to train him besides "sit", "lay down", "paw", "pound it" (nose bump), and "say please". He was the goodest and best boy an inexperienced and, admittedly, lazy dog parent could have had. Anyways, I have an 11 month old lab/terrier mix (that's what the rescue said she is) and she just wants to love on and be loved on by every person she sees, play with every dog she sees, and chase and play with all the cats. She is highly food motivated, so I will try using hotdog chunks but her kibble isn't cutting it for people and dogs. What I've been doing: For the cats- When Sammy goes after a cat I call her name and say "leave it." When she comes to me I give her a kibble and tell her "good leave it." I think it has been working, but I'm concerned she may associate the treat with going after a cat and think if she goes after the cat that she'll get a treat for it. Thoughts?

For the people and dogs- I usually see the people and dogs first. I'll wait for her to notice the thing and then her body will go rigid. Then I tell her "leave it" and try to get her attention focused on me and the food. When I get her attention I'll tell her "good leave it" and give her the treat. But then her attention goes back to the thing and I have to repeat the process.

If the thing gets closer to us she gets so excited and distracted that I am not able to redirect her. She tries to get to the thing and pulls on her leash to the point of standing on her hind legs and choking herself. As I said, I will be trying hotdog chunks but I wanted to reach out and see what people have to say.

Thank you for reading!

Edited to add: time outs don't work on her for the cat chasing. I have 3 cats, one of which LOVES instigating. Sammy loves this cat because he is the only cat that will play with her, and he immediately accepted her when we brought Sammy home.