I don't advertise wholesale, however I still receive wholesale requests every month. I can't fulfill each request as I am the only maker of my ceramics and they are very time consuming to make. What I do is ask for a tax permit, ask for a detailed list of what they are interested in(this is usually how I can determine if/when I can do business with them), tell them my wholesale guidelines (min. order of $200..etc, estimated date I will have their order shipped...) My wholesale prices are 50% off of my retail prices. If all works I send them an invoice : ).
I have a separate book where I keep each wholesale account. I usually take on 1 wholesale account every 2 months. If a store wants to hold a spot in line I require 1/2 deposit. I also include plenty of business cards with each wholesale order.
If you haven't received any wholesale requests and are interested in doing so, I would recommend looking at local boutiques, especially pet shops. Perhaps put together a portfolio of your wholesale guidelines and pictures of your designs, take samples of fabric and at least 1 completed teepee to show with you.
Also in my opinion I would be advertising your teepees for both cats and dogs. I know my chihuahuas would love to nap in one : )