Tennis balls are perfect for dogs....regardless of size, it seems. They're hard enough to withstand the chewing, but just squishy enough to not break when they bite into them. [img]http://4.bp.blogspot.com/-U3mUG2eMhXw/UPRtND8Q9_I/AAAAAAACQLQ/jn-fbJBw4lo/s400/Dog+&+Tennis+Balls+(1).jpg[/img] [img]http://2.bp.blogspot.com/-8smKm7RnVrw/UPRtN5LzpMI/AAAAAAACQLY/ycahSGIkOLc/s400/Dog+&+Tennis+Balls+(11).jpg[/img] [img]http://2.bp.blogspot.com/-4i-vwmNx2VA/UPRtOlwdnFI/AAAAAAACQLg/-OGlsglVkJ8/s400/Dog+&+Tennis+Balls+(12).jpg[/img] [img]http://3.bp.blogspot.com/-NDR-noYZxIM/UPRtPRaLXyI/AAAAAAACQLo/d_3b8fw7Hzs/s400/Dog+&+Tennis+Balls+(13).jpg[/img] There are a whole bunch more here: [url]http://www.dailypictur.es/2013/01/dog-tennis-balls.html[/url]