Hello @phenzzy, you wrote:
It is often noted on the skin or hair under the tail or on bedding and furniture where the dog has laid. Fever, lethargy, anorexia, and depression may or may not be present.If the cervix is closed, pus that forms is not able to drain to the outside. It collects in the uterus causing distention of the abdomen.The bacteria release toxins that are absorbed into circulation.These dogs often become severely ill very rapidly. They are anorectic, very listless, and very depressed. Vomiting or diarrhea may be present.

And we found on the website,https://www.vetwest.com.au/pet-library/pyometra-in-dogs, this:

It is often noted on the skin or hair under the tail or on bedding and furniture where the dog has laid. Fever, lethargy, anorexia, and depression may or may not be present.

If the cervix is closed, pus that forms is not able to drain to the outside. It collects in the uterus causing distention of the abdomen. The bacteria release toxins that are absorbed into circulation. These dogs often become severely ill very rapidly. They are anorectic (off food), very listless, and very depressed. Vomiting or diarrhoea may also be present.

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