Although your lawyer will help you decide what type of document best suits your needs, you should be aware of some drawbacks to wills. For example, a will takes effect only upon your death, and it will not be probated and formally recognized by a court for days or even weeks. What's more, if legal disputes arise, the final settlement of your property may be prolonged. Even determining the rightful new owner of your pet can get delayed. In other words, it may take a long time before your instructions regarding your pet's long-term care can be carried out.
This doesn't necessarily mean that you should not include a provision in your will that provides for your pet. It just means that you should explore creating additional documents that compensate for the will's limitations.