Interesting, never heard the half a cup thing. Nor that the amount of fluid affects the ultrasound - after all, one of the things you're looking for with ultrasound is amounts of fluid, right? I'll mention that one to the vets I work with - I suspect it's another one of those things that some vets insist on, others have never heard of, and some will laugh at and call nonsense.
The approach that our practice takes is that a dehydrated animal handles GA/sedation and stress less well than a hydrated one - so it's OK to offer water (especially with elderly animals).
Looks like this is another one of those vet questions that has more than one answer!!!
(Try asking three vets when you should spay a bitch, and the chances are high that you'll get three different answers and three reasons why...)
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1.1.0 Yellow Rat Snake (Sam The Bad & Sally); 1.5.0 Corn Snake (Thumper, Lucy, Wisp, Ash & Spectre); 0.1.0 White Sided Black Rat Snake (Rosie); 1.0.0 Black Rat Snake (Magpie); 0.1.0 Albino Black Rat Snake; 1.0.0 Kenyan Sand Boas (Long); 1.0.0 Burmese Python (Oli); 1.1.0 Royal Python (Roo and Rohypnol); 1.1.0 Mandarin Rat Snake (Zen & Mei-mei); 1.1.0 Normal Bull Snake (Zico & Bandita); 1.1.0 Albino Bull Snake (Bandit & Boxer)
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