I did not check a pet before buying it and did not know but it is not fertile my question is can the be reversed?

No it can not be reversed. The Infertility philters/kit where designed to help people protect their projects, and thus all of the time as well as resources spent to complete the project. Project pets are NOT a cheap task to undertake, and for this reason many of us requested a way to protect our hard work/investment.

You may however be able to find the project owner and talk with them about getting an offspring similar to or exactly like the pet you bought that, and you could talk it over with them on if you could get like limited breedings. Though you may wish to state that you don't plan on selling offspring, or that you will only breed to non project or project look alikes.

Thank you. I will do that.

You're welcome, glad I could help. :)