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Location: Shadowland, Australia
Joined: Apr 2004
Posts: 7,358
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Sounds like a split estrus:
"Split Estrus. Occasionally, a bitch will enter proestrus and fail to enter estrus or will experience a very short estrus. If the bitch is bred, conception will usually fail, however, the owner will note that within 3 to 4 weeks the bitch is demonstrating signs of entering proestrus again. Thereafter, the bitch proceeds normally through the subsequent stages of reproduction. This condition is known as Split Estrus. Split estrus occurs more commonly in young, first-estrus bitches, however, older bitches may also be affected. Split estrus usually resolves without the need for treatment. Recurrent incidences of split estrus in a bitch, however, may suggest chronic premature luteolysis (inability to maintain sufficient elevation of the serum progesterone concentration) or an underlying health disorder such as hypothyroidism."
Perhaps you will have to board out your boy so that he, and you, can get a bit of peace.
SB