Most people that have e-mailed them have not received any reply, not even a confirmation that the e-mail was received. However on Super Pet USA's Facebook page we have gotten a reply of sorts:
"Thanks for the input! We love hearing from you and appreciate any and all feedback on our products. This is helpful! We value your feedback and will definitely take a look at this."
It is nothing solid, however it is something. If any of you have a Facebook account then a comment could be posted on the page, they seem to monitor this page more closely than their e-mail system. The link to their page is here: Super Pets USA Facebook Page. It all helps, thank you everyone!