Carole, if you are going to do a raffle or some kind of contest just call local businesses, explain the situation and ask if they could donate a prize. Make up a flyer listing all the businesses who donate to distribute around - even ask if you can put one up in their business. Call local newspapers and radio stations and ask if they will run a Public Service Announcement about the situation and contest - this should be free.

If things there are like here you will be surprised at how many will probably donate. I used to work in Public Relations and one job I had was the head of a school aluminum recycling contest. I could get pizza places to donate pizzas, Walmart donated gift certificates, sporting good stores donated sport supplies and so on. Be sure to call your local pet stores to try to get them involved and if you tell them there will be some kind of advertising (flyers - public service announcements) they are usually willing to participate. If the cause (the shelter) is non-profit they usually are very willing to help.

I know that is a lot to do but it's a thought. Good luck.