Defective breed of pets sold

We bought 2 rats from this pets shop and both had severe respiratory problems from the start. These rats were sisters and came from the same parents and it is evident that the gene is very weak. I would not advise anyone to purchase any rats from Arthur's Pet Shop. They stayed very thin and weak and we had to take them to the vet for constant treatment. The one died at 10 months and the 2nd one died at 17 months. We rescued a rat from a lady in PE and he is healthy and fit and has no problems of any kind. Please spare your kids the pain that we had to go thru and please please please do not buy rats from them