I am very sorry for your loss!!! I to recently suffered the loss of my best doggy friend, a true love of my live. I was and still am devastated by his loss. My puppy Roxi was unbelievably attached to Boscoe, he was her big brother and best friend and they spent all their time together. After he passed, Rox ran around pacing everywhere looking for him, and stopped eating and couldn't be in a room alone and followed me everywhere! Everything else I knew work work itself out in time but the not eating was something that could not continue as it had been about a week and for a 5month old pup not eating is not a good thing. I to went to the vets and had tests done on her but nothing was wrong with her physically. She was depressed, just as I was. Up until the end I was putting Boscoe's food into the blender for him so that he could pass it through his digiestive sysem easier, and Roxi would lap up all the food Bos dribbled on th floor, SO what I did for her because she was still drinking is I cooked for her and soaked her kibble in water and made some ground turkey, beef whatever was good for her and shoved it all in the blender. Then I would pour it into a bowl that was not her usual eating bowl, and took it into the living room (gave her a different room to eat in so that she was not expecting Bos to come join us) and sat with her while she lapped it all up! You could try changing bowls, and rooms, change up the routine a bit, because dogs are routine and what I found with Rox was that she was sittign waiting for Boscoe to show up and eat because she woudl always eat after him. Anyway you could try it, I hope things get better for you and your girl.
