Like several states, Tennessee offers an "Animal Friendly" license plate.  Tenn. Code Ann. §55-4-290  The proceeds from the sale of these plates go into a fund "to be used exclusively for grants to non-profit organizations or governmental agencies to provide low-cost spaying and neutering of unsterilized animals to prevent and/or reduce animal overpopulation".
The fund receives about $15 per license plate.
Currently, the Tennessee Department of Agriculture is accepting applications for grants for spay/neuter.
In 2007 46 non-profit organizations and state agencies received $190,000. The same amount is expected to be available this year.
Click here for grant applications for non-profit organizations and government agencies.  Applications are due by June 2.
Support spay/neuter. Have a 501c3 organization you know apply for a grant to perform low cost spay/neuters in Tennessee.
New York implemented its provision allowing the public to buy animal friendly license plates in 1996. The proceeds support its animal population control program. NY CLS Veh & Tr § 404-p. Other states with animal or pet friendly license plates are Georgia, O.C.G.A. § 40-2-49.3; Illinois, 625 ILCS 5/3-653; Kentucky, KRS §258.119; Missouri, RSMo §301.3087; North Carolina, N.C. Gen. Stat. §19A-62; Ohio, ORC. 955.202; Oklahoma, 47 Okl. St. §1135.5 (31); South Carolina, S.C. Code §56-3-9600, Utah, Utah Code §41-1a-418;  and Washington, RCW §§46.04.705, 46.16.30914.