Whew! why foul breath (4 replies):I know bacteria in the mouth causes bad breath and Sugar...[more] Dental care (1 replies):How best to clean his teeth and care for them Aleda M Cheng, D.V.M., C.V.A Jul 03, 2008 I think it best that you have her mouth and teeth examined, and if the vet deems it necessary to perform blood work and other diagnostics it would be warranted.