<human>: Give me the gist of the text in a nutshell

Disclaimer: I write this post knowing I am already an overprotective dog dad...

Recently, my Girlfriend and her dog moved into my place (just for a few months until she moves out of state). Her pup and my pup get along great. They enjoy playing with each other, cuddle together, and have never gotten into a real fight (just scuffles when one is playing too rough and the other doesnt like it). My dog is pretty submissive while her dog is definitely more on the dominant side. Usually this is not an issue, and I'm not sure that it even is an issue now, but I am a little concerned that my little guy is starting to feel less comfortable in his own home. 

The thing that is concerning me most is that my guy doesn't use a dog bed, but is very attached to his crate (he has two in the house). Her dog is obsessed with his bed. Recently, when his bed is in a room that is closed off, he will go into my pups crate. I don't mind this too much except that whenever my dog gets near the crate when hers is in it, her dog growls at mine. 

This happens with some other things as well, but the bed/crate situation is the one that concerns me most because the crate is my pups safe spot and he can become uncomfortable if he cant get into his crate. So, I am wondering if I need to make sure her dog doesn't get into the crate, or if this is just dogs being dogs and I am worrying too much and need to let it go?
<bot>: Girlfriends dog takes my dogs crate and growls at my dog when he tries to go into it. Should I stop it?