Do dogs express 'jealousy'?

I don't really understand this behavior in dogs.

I took my two to a new groomer today. The groomer went over Zeeva first, checking her teeth, giving her a rubdown and looking at her nails. When she proceeded to do the same with Smokey, Zeeva sort of flipped out by barking in a high pitched tone and wanting to walk over to the groomer and Smokey.

I've also noticed that when I, or anyone for that matter, gives Smokey affection, Zeeva proceeds to come between Smokey and the person giving affection.

What is this behavior? Is it jealousy? Is it something that needs to be discouraged? Is it resource guarding? Of Smokey?

Also, I don't want to start a new thread so I'll ask here. The groomer suggested some kind of deshedding regime that I didn't really understand. It's in addition to a traditional bath and brushing. I should've had her specify, but the regime she claimed helps prevent shedding after a few treatments. Does anyone know what I'm taking about and how well or if it works???

I cannot imagine any kind of regimen that would stop a husky from shedding. But I am no expert either.

it's resource guarding but not of the other dog but of the people affection.
"Hey you look at me never mind the other dog here i'm the center of attention you should only be petting and loving on me." In my mind it should be discouraged but i'm not sure how you go about it.

Are you taking them to Petsmart by any chance? They have this thing they try to sell to me all the time called the "furminator de-shedding treatmeant" I never take it because I don't want them to use a furminator on my Sibe. I can't trust that they will use it properly and not rip out a bunch of guard hairs. The shampoo itself however does have some pretty decent reviews on Amazon. If anyone has experience with Petsmart's treatment or the shampoo itself please chime in. You could try it, or just buy the shampoo off amazon and use a safer tool to groom your dog.