I hope that he's okay. :-(
Krypto does that; barks at things that I can't see/hear. We found out the other night that there are a pair of dogs running along the highway edge barking. He's been barking at them, we learned.
It's understandable that you are concerned; I would be too. Especially after losing Chance. Could things be worse now because of losing Chance? Suddenly, his bird is gone, the cage is gone...perhaps they didn't interact pre se, but Chance has always been there, and now he's not.
As far as his weight, maybe you could find some low cal treats? I used to get some sweet potato and rice treats that were low calorie, and gave them to Tango. He never needed to take off weight, but maybe that's why?
Another thing that might help, is adding a spoon of canned pumpkin to his food. In case he's feeling hungry at all.
Generally, one of 4 things causes grass eating. 1 - A dog not feeling well. 2 - Feeling hungry. 3 - Just liking to eat plants. Krypto is eating every grass and weed in sight, which concerns me, as they can't all be healthy, and he won't stop. He's always been a plant eater. But, especially in the spring and fall. 4 - Having worms.
Prayers for Charlie, and you. (((Hug!)))
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