We sell Lupine brand collars, leashes and harnesses at the shelter. They are guaranteed for life. If they break or are chewed through they are replaced......for life!
I've never seen one come back because the clip failed. I have a Lupine leash for Taggart and the clip is the kind that you just press on the collar loop to attach. Zoee's is the regular leash that you pull the little thingy back to hook it on. Luckily I've not had problems with either leash.
Check online and see if you have any Lupine distributors in your area.
I would definitely buy a new leash. You might have to spend a little more money than you'd like, but you'd feel a lot better about walking Mikey.

I know how you feel though. Taggart got away from me today out of the car when we stopped to potty. But he stayed right by the car, luckily. If it had been Zoee she'd have ran off and I would have had a heck of a time getting her back to me.

Please give Mr Serious Face a kiss for me!