How to do research about Competitors

Research:
1. You'd be surprised how often companies will tell you everything you'd like to learn over the phone, especially if the question is phrased in a context that makes sense. For example, if you want to know how many people work there, you can say: 'I'm looking for individualized attention, and my fear is that your organization is too large, and I'll get lost in the shuffle. How many coaches do you have on staff? Oh, wow, that's quite a few.
2. Seriously. The art of bartering — that is, exchanging stuff and services for other stuff and services without spending any money at all — is becoming huge. People are bartering almost anything and everything imaginable these days, from roof repairs to legal services to Pilates sessions to hotel accommodations to baby-sitting shifts.
3.

Questions:
1.  Who are your competitors ? [Need to identify all competitors, not just top 5, which will overlook some competitors.]
2.

References:
http://www.inc.com/guides/201105/10-tips-on-how-to-research-your-competition.html
http://www.lifeedited.com/share-your-best-friend-with-these-dog-sharing-sites/
http://www.today.com/id/33509970/ns/today-money/t/tricks-swapping-your-way-free-stuff/#.VcC6CpNViko
http://articles.latimes.com/2013/jan/07/local/la-me-dog-share-20130107


News:
http://sharetraveler.com/peer-peer-pet-sitting/
http://www.yelp.com/topic/atlanta-dog-swap-pet-sitting-services
http://www.yelp.com/biz/city-dog-share-san-francisco