Finding information concerning physical education in databases may be challenging, simply because scholarly resources require a longer process and more vetting than the web!
The web is in conflict with the streamlined process of print publishing, possibly due to its haste in providing and disseminating information. The web can be riddled with issues of misinformation, bias, and steering. So what can you do? You can tell Google where to go - to search that is!
You are able to tailor a search and target specific websites regarding specific topics.
topic: children with autism AND pet therapy
children with autism OR pet therapy site: autismspeaks.org
or use the domain extension only to find a variety of sources: .org to find organizations, .edu for academic sources, .com for company sources.