My 2 year -old Catahoula hasn't been acting like herself today. She's been a little trembly, as if she were scared of something (very unlike her). I've kept an eye on her and finally noticed this evening that she goes to urinate but doesn't. After that realization we gave her a gentle massage and she voided one stone slightly smaller than dime size and several very small pinhead size stones. She is in pain but seems a little relieved and is sleeping right now. My vet is open in the morning. Is there anything I can do/ should do for her this evening? Do dogs usually develop loads of stones like goats or are they more like humans who might pass one stone and be okay? She is a spayed, athletic Catahoula, up to date on everything, very healthy ordinarily. Thanks in advance.