Well, that's interesting. I surely hope that will not be the case with my Pyrenees. I am hoping that feeding her a grain free diet will prevent the issues you have mentioned above, especially joint issues. Mine is a working dog also and early spaying did not seem to affect her growth. She weighs in at 120lbs. How early can large dogs like this become pregnant?
When they go through their first estrus cycle and therefore could conceive varies from dog to dog. In one LGD group I'm in, several owners had dogs cycle at 7 months. Mine is 10 months. Others don't cycle until they are 12+ months.
Grain free doesn't make a difference. It's the calcium level you should be concerned about. Too little, too much....either way can impact their orthopedic development. Joint health also has a genetic component, not just nutrition. Hip dysplasia is known to be genetic, which is why breeders should be doing Penn Hip or OFA certification before breeding their dogs, and one cannot determine hip normality until the dog is 2.
Joint health does not seem to be impacted by early alter...but early alter might contribute to ligament injuries, bone cancer and soft tissue cancers in breeds like the Golden and Rott (those are the breeds under study).
Weight is not an indicator of muscle mass. I see plenty of dogs that are 100 lbs but are overweight.
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