Minggu, 09 November 2014
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False Pregnancy: Understanding When Your Dog Goes Through Pseudocyesis
Your female dog was in heat about two months ago, and now she's behaving as if she were pregnant. Her breasts are somewhat enlarged and have a thin yellowish fluid or actual milk coming from them. She seems unusually nervous and excitable, can't settle down, and may even try to make a "nest." Finally you notice her carrying a shoe, toy, or other object around with her, much as she would a newborn puppy. But wait a minute! She hasn't been near a male dog - she can't be pregnant! And she isn't. She is going through a false pregnancy.
When your female dog is in heat, a yellow body is formed in the ovary, whether or not conception has taken place. During pregnancy, this remains active and functional, secreting the hormone, progesterone, until whelping time. In the non-pregnant dog, this usually degenerates in about a month. For reasons still not well understood, the corpus deteriorates much slower in some females, and its prolonged presence is believed to trigger the false pregnancy. Symptoms can vary from being hardly noticeable, through all those mentioned in the previous paragraph, to severe painful engorgement of the breasts with milk freely flowing from them.
Pseudocyesis occurs at all ages from the first puppy heat on. It may happen only once and never recur, but in most cases, once started, it tends to recur about two months after each, or most, of the successive heat periods. This can be a special problem in the older dog. The additional stress it produces can result in vomiting, diarrhea, self-nursing, inflammation and infection of one or more breasts, and loss of appetite. Dogs with chronic kidney disease may be stressed enough to precipitate a uremic crisis and renal failure. Dogs with cardiac disease may develop potentially dangerous abnormal heart rhythms.
Mild to moderate cases will run their course in three to eight weeks, depending on how rapidly the corpus luteum degenerates, and require little treatment. The more severe cases will be helped by alternate hot and cold moist compresses on the swollen breasts to relieve the pain. Therapy with estrogens, testosterone, and progesterone injections have all been effective to varying degrees in terminating the false pregnancy. If fever or breast infection is present antibiotics will also be prescribed.
There is no hard evidence to prove it, but many veterinarians in companion animal practice are of the opinion that repeated false pregnancies, especially the severe ones, are likely to predispose your dog to the eventual development of pyometra, a serious and hazardous uterine infection. For that reason, your family veterinarian may recommend an ovariohysterectomy for your dog.
False Pregnancy: Understanding When Your Dog Goes Through Pseudocyesis
Your female dog was in heat about two months ago, and now she's behaving as if she were pregnant. Her breasts are somewhat enlarged and have a thin yellowish fluid or actual milk coming from them. She seems unusually nervous and excitable, can't settle down, and may even try to make a "nest." Finally you notice her carrying a shoe, toy, or other object around with her, much as she would a newborn puppy. But wait a minute! She hasn't been near a male dog - she can't be pregnant! And she isn't. She is going through a false pregnancy.
When your female dog is in heat, a yellow body is formed in the ovary, whether or not conception has taken place. During pregnancy, this remains active and functional, secreting the hormone, progesterone, until whelping time. In the non-pregnant dog, this usually degenerates in about a month. For reasons still not well understood, the corpus deteriorates much slower in some females, and its prolonged presence is believed to trigger the false pregnancy. Symptoms can vary from being hardly noticeable, through all those mentioned in the previous paragraph, to severe painful engorgement of the breasts with milk freely flowing from them.
Pseudocyesis occurs at all ages from the first puppy heat on. It may happen only once and never recur, but in most cases, once started, it tends to recur about two months after each, or most, of the successive heat periods. This can be a special problem in the older dog. The additional stress it produces can result in vomiting, diarrhea, self-nursing, inflammation and infection of one or more breasts, and loss of appetite. Dogs with chronic kidney disease may be stressed enough to precipitate a uremic crisis and renal failure. Dogs with cardiac disease may develop potentially dangerous abnormal heart rhythms.
Mild to moderate cases will run their course in three to eight weeks, depending on how rapidly the corpus luteum degenerates, and require little treatment. The more severe cases will be helped by alternate hot and cold moist compresses on the swollen breasts to relieve the pain. Therapy with estrogens, testosterone, and progesterone injections have all been effective to varying degrees in terminating the false pregnancy. If fever or breast infection is present antibiotics will also be prescribed.
There is no hard evidence to prove it, but many veterinarians in companion animal practice are of the opinion that repeated false pregnancies, especially the severe ones, are likely to predispose your dog to the eventual development of pyometra, a serious and hazardous uterine infection. For that reason, your family veterinarian may recommend an ovariohysterectomy for your dog.
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