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I am on a mastiff forum that recommend breeds as large as those should wait until 2 years. Their reasoning is sensible though, so I would not doubt it. For cats before 6 months is usually the perfect time (to avoid heat/spraying/etc). I had all my cats neutered at 5 months. I don't have a lot of experience with large breeds, but all the large breed owners I've talked to wait until the animal is fully mature, usually anywhere from 12-24 months.
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