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If you were in invitee to the property, which is what you were, you were owed a duty of care to warn you of known risks of harm. Thus, you would need to prove that the owner knew or should have known of the disease and failed to at least provide you a warning or to fix the problem. This would mean they would be liable for all injury to you and damage to your property that their negligence caused, since you are aware your dog is considered only property in CA.
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