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I couldn't not to reply to this after i saw the site. It's just touching and well, cute..
Your site is far from being a failure since you actually have history, not only a former succesful site, but the lost doggies found. You are helping those dogs and also helping their new owners. I am sure it means alot to them.
I am usually completely "closed in" tech world on the web, never browsing the real-life relates sites like this and i don't know if i could ever run such a site, and when i see your i get touched by it.
So don't quit, your problem is not that big, you just need to get that redirect set and you'll be fine.
If your site is a failure that what's mine, i have it for 2 month with only 44 members, low activity and tough "market" to get through (not the competition, but because i am covering a very wide area of topics).
It's a challenge however, and it can actually make it fun and exciting. And in your case, you have even more, you got history, past success and experience.
Keep it up man!
Good luck
Daniel