How? Well, THAT'S the real problem.
More Inspectors/Inspections? A registry of approved facilities? Perhaps public web-cam access for facilities over a certain size? (NOT the family/small breeder). Most people would not have a problem with the sale of pets as long as the pets AND the parents of the pets were treated properly. We just have to figure out how to make that happen.
The problem is not with the consumers - it's with the suppliers.
An analogy: If a manufacturer of Peanut Butter is found to have produced a product which is contaminated with Salmonella (which has happened), or if a manufacturer's facilities are found to be in violation of health codes, they are required to take action (fix the problems) or be shut down. This is the suppliers problem. If you wanted to make it the consumers problem, you would push for legislation to make it illegal to sell peanut butter (thereby putting the manufacturer/supplier out of business), or take other restrictive actions directed at the consumer end. This is what appears to be happening in the pet business - It should NOT be made illegal to sell pets - It should be illegal to operate a kennel or facility in which animals are abused and/or not provided with basic care and necessities!!!
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