I am dog hosting and at first my own dog was fine, but now that the other dog is here, he is being super standoffish and scared looking. How can I make my own dog feel more comfortable (I'm giving him attention- massaging his belly, cuddling next to him, talking to just him)? I feel like maybe he is scared I'm replacing him. I also don't want to ignore the dog I'm hosting!

How do I make sure my dog is comfortable