My Pom did the same thing. She would drink until she vomited. We just put down a smaller amount of water for her until she got past the guzzling phase. She kinda grew out of it, but even now, she'll just guzzle water out of the blue. Vet says it's just a quirk and to not worry about it...but she said that after we made sure there wasn't a medical reason.
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RIP Sebastian, Baby, Cheyenne, Baxter. Gone but never forgotten.
Finnian The Irish Lad WGSD: SAR
Abeni the Little Warrior: Pomeranian rescue.
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