Thanks again for your question regarding your Golden Retriever boy. As you can imagine, there are a number of possible causes for this vomiting including anything from acute gastroenteritis, to a toxicity, to intestinal parasites. As you say, it is definitely possible this began from perhaps getting in to something at the park. It is very unlikely this all began from him just over-doing it however. It is a relief to hear your other two dogs are currently fine. Just in case this is an infectious gastroenteritis, please try to get your sick Golden boy away from the other two. Also be sure to wash your hands carefully after petting and handling him, as some canine infectious GI bugs can affect humans too (salmonella and campylobacter for example).
First things first - please try and encourage your boy's water intake - this is very important. All of this vomiting means he has an increased need for water, so it is very important this is available all the time. If he can't keep water down, then you need to get him to your local Vet clinic or ER vet for intravenous fluids. The best plan for today would be to with-hold his food for the next 10 - 12 hours. You can then start him on a bland diet of cooked boneless, skinless chicken
breast and rice for a few days, after this time.
Please keep a close eye
on his mucus membranes, capillary refill time and respiratory rate today as follows:
Mucus membranes - flip his lip and look at the color of the gums. They should maintain a nice salmon pink color. Get him to the 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 his 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 Vet.
Respiratory Rate - if he is continuously panting throughout the night this is a sign of shock and or pain and a signal for a trip to the Vet.
If the vomiting continues today, despite with-holding food and if he isn't keeping much water down, then you really should get him seen today if you can. In the meantime, you may want to try a little Pepcid. The typical dose is 0.25mg per pound of body weight up to twice daily. You can read more about the use of this here: http://www.petplace.com/drug-library/famotidine
Best of luck with your boy and do continue to keep a close eye on him. As above - if he can't keep water down, then he could quickly become dehydrated, so make sure you get him seen if this is the case.
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