Suspected something might be wrong, we invited the vet to the house to check on her as well as giving Hercules his annual Heartworm jab. True enough, vet confirmed she have vaginal infection and her uterus is already filled with pus.
The moment the vet said that, $$$$$ I saw our household money flying $$$$$
To cure her, she have to receive weekly jab and antibiotic course, for at least 4 weeks. 1 week course costs RM100.
Poor girl, she must have been in pain all these while and we failed to notice that. We should've paid more attention to her signs...