Journals are a secondary source that can be very helpful for pointing you to other primary sources and laws. Journals can be especially helpful in providing insight into recent developments in animal law, as well as interesting legal analysis.
Below is a selection of journals available through USD that focus on animal law. Some of these are available in print, and most of them are available online:
Australian Animal Protection Law Journal
Journal of Animal & Environmental Law
Journal of Animal and Natural Resources Law
Journal of Animal Law and Ethics
Journal of International Wildlife Law & Policy
Stanford Journal of Animal Law and Policy
You can also search for other journals on Lexis's Law Reviews & Journals page or Westlaw's Law Reviews & Journals page.