Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12917-018-1390-7/MediaObjects/12917_2018_1390_Fig2_HTML.gif)
Spearman’s rank correlation testing for TPC and VA of tear samples collecting with PVA sponges in 10 healthy dogs. A moderate negative correlation was found (Spearman’s rho = − 0.48, P = 0.033)
Spearman’s rank correlation testing for TPC and VA of tear samples collecting with PVA sponges in 10 healthy dogs. A moderate negative correlation was found (Spearman’s rho = − 0.48, P = 0.033)