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If this has been going on all day and Lucy Lu hasn't really been able to keep her water down, then I would definitely encourage you to get her examined at your local emergency vet this evening. The main worry now is that if she isn't able to keep water down, then she could very quickly become dehydrated. Whatever the case you will definitely need to visit your Vet first thing tomorrow morning unless this vomiting settles. In the mean time, please keep a close eye on her mucus membranes, capillary refill time and respiratory rate as follows
Mucus membranes - flip her lip and look at the color of the gums. They should maintain a nice salmon pink color. Get Lucy Lu to the emergency Vet if they appear white or very pale pink, or if they are a dark deep red color.
Capillary Refill time - this measures blood perfusion and test this by putting your thumb on her gum to apply pressure. After you release your thumb you will see the gum blanch. Capillary refill time is the amount of time it takes (in seconds) for the gum to return to a healthy pink color from the blanced white color. If 2 seconds or less don't worry - if it is taking significantly more time, again - off to the emergency Vet
Respiratory Rate - if she is continuously panting tonight, this is a sign of shock and or pain and a signal for a trip to the emergency Vet.
In the mean time, you need to with hold food until the morning and then start her on something really bland. I would suggest cooked, boneless, skinless chicken breast and rice for a few days. You also need to encourage her water intake. If she can't keep this down, then she really needs to be seen today to have an IV line placed to rehydrate her.
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