Some good info here about Amazon and pet supplies:
http://oneclickretail.com/pet-products-the-amazon-effect/
And here:
http://www.petbusiness.com/November-2012/An-Amazonian-Challenge/
And another one - the chewy.com comparable would be petcircle.com.au: https://retail.emarketer.com/article/heres-why-petsmart-wants-chewy/58f7d3caebd4000a54864b23
Here's a research report into a comparable company to GXL in the US: http://www.mscience.com/wp-content/...ply-Industry-Update-Q2-14-ReBrand-FINAL-2.pdf