My poor fur baby .. HELP ?!

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Okay fur mamas, idk what to do. My 8 year old chihuahua Chase has been acting out. Me and my man just got a new chihuahua puppy and ever since Chase hasn’t been the same. First off he’s like terrified of them and growls when they come near him or run and jump on something they can’t reach. Now he won’t eat any food. Idk why. It’s gotten to the point of him throwing up all the time, and it’s just stomach acid or something. I’ve talked to his vet and she said if he doesn’t eat within a couple days to bring him in ☹️.

Chase 💙 (8 y/o)

Nova 💖