... Based on what I have seen over the years, the average 8-10lb (3.6-4.5kg) cat would usually be given around 100ml a day. Larger cats might need 125ml, or even occasionally 150ml for cats who weigh 15lb (6.8kg) or over, whilst smaller cats need smaller amounts, 50-75ml a day. Be cautious with cats with
heart issues, who may have problems processing sub-Qs, and who may need smaller amounts, perhaps given more frequently, for example 50ml twice a day rather than 100ml once a day.
Since cats vary in their individual needs, you should seek your vet's advice on how much to give your cat, and start off gradually, and aim for the lowest level that will comfortably maintain hydration. If you live in a hot humid area without air conditioning, your cat might need more fluid than a cat in a colder climate. If your cat has a bout of vomiting or diarrhoea or is not eating, more fluids might be required in the short term to offset the fluid lost as a result of the crisis. Cats who are diagnosed following a severe crash may possibly require more sub-Qs, but this is not always the case, particularly for cats whose crash is causes by
acute kidney injury, who may need no sub-Qs at all once they have recovered.
When deciding on how much fluid to give, you need to monitor your cat for
dehydration and check that the fluid is being properly absorbed. A
pouch is normal, and it usually takes 6-8 hours for the fluids to be absorbed, though some cats take longer. Many people find the simplest way to monitor their cat's need for fluids is by means of a
weighing scale: you can weigh your cat regularly and if his/her weight goes down, this may indicate dehydration; if the cat's weight increases, the cat may be retaining fluid and at risk of overhydration.
Coco's Page has more information on how to do this.
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