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The ammonia smell and the increase in water consumption are two symptoms that indicate it's time for her to go to see your vet. They will likely want to run a urinalysis on her and also some lab work to ensure the ammonia smell is not caused my underlying kidney disease and/or diabetes. Until you're able to have her seen, make sure that she has free access to water and that she's urinating just as frequently as she's drinking. We want to be sure she's not drinking, but avoiding urination for any reason. Urinary crystals and stones are common in bichons and their associated breeds.
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I'm here. Thanks for your reply. I apologize, I misread your question to read that she was consuming a lot of water, which was uncommon for her.
The ammonia smell that you're picking up is still enough concern to warrant a visit. One second here and I'll provide you with some additional information.
It does take a few minutes for responses to come through on both ends.
Here's some additional information. Although she's a cavachon, she still will carry the breed predilection for urolithaisis from the bichon side of her breeding: http://bichonhealth.org/HealthInfo/UrinaryStones.htm
Here's some additional information on the ammonia smell that you're detecting, as well: http://bichonhealth.org/HealthInfo/KidneyDisease.htm
If you need a phone call, let us know. The same information will be shared there, as well. You'll get the most useful information from laboratory testing performed by your vet's office.
Let us know if you need further assistance.