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Response to milestogo (Original post)

Sat Dec 26, 2020, 06:35 PM

11. You might research growth plate closure in Australian Shepherds on breeder sites

Below is just an average reference:

Growth plates gradually thin as hormonal changes approaching puberty signal the growth plates to close, and in most puppies, this is around the age of approximately 18 months old. At that point, the plates “close” because they’ve contributed all they can to the growth of the bones. The growth plate becomes a stable, inactive, part of the bone, but before then, the plates are soft and vulnerable to injury. An injury to the growth plate might not heal properly, nor heal in time for a puppy to grow up straight and strong. Such an injury can result in a misshapen or shortened limb, and that in turn can create an incorrect angle to a joint which can make the puppy more prone to even more injuries when he grows up.

But what about neutering a dog? How that that impact a growth plate?

Part of the responsibility of sex hormones is to regulate growth. When the sex hormones are removed, growth hormones are missing important regulatory input and the bones continue to grow longer than they ought to. Growth plates lay down bone as a puppy develops and, as it builds bone, the bone becomes longer and the puppy gets larger and taller. Once maturity is reached, this growth plate turns into bone and the puppy’s full height is reached. Most breeders can spot the difference between an intact dog and a dog neutered too young, and studies have proved it to be true (Salmeri et al, JAVMA 1991).


Chris Zinc DVM PhD DACVP said, “…if the femur has achieved its genetically determined normal length at eight months when a dog gets spayed or neutered, but the tibia, which normally stops growing at 12 to 14 months of age continues to grow, then an abnormal angle may develop at the stifle. In addition, with the extra growth, the lower leg below the stifle likely becomes heavier (because it is longer), and may cause increased stresses on the cranial cruciate ligament,” so now we have a connection to cruciate tears.


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milestogo Dec 2020 OP
pamdb Dec 2020 #1
Dustlawyer Dec 2020 #2
milestogo Dec 2020 #3
True Dough Dec 2020 #4
milestogo Dec 2020 #5
Bayard Dec 2020 #6
milestogo Dec 2020 #9
Doreen Dec 2020 #7
TDale313 Dec 2020 #8
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Donkees Dec 2020 #11
milestogo Dec 2020 #14
zeusdogmom Dec 2020 #12
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