dogwasher,
I prefer stainless like we have. We made drawings, built a rough cardboard prototype & had ours done locally with stainless & high 40 inch walls except in the front where we have a 20 inch sliding
door. We used 14 gauge stainless. Our 30 inch depth with 48 inch wide made the tub similar to a 60 inch tub with 24 inch dept ----- when you see how large the Great Danes & St Bernards & Newfies can be ---- there is an appreciation for that. The extra diagonal length that we did is helpful.
2 things to consider: 1. With the high walls dogs seem less likely to step over & get injured & the high walls contains the dog shake when the dog is the wettest for a gain in cleanliness. 2. I know I some disagree over this but so far I do not regret letting the customers adjust the tub's height in a smooth way for better quickness, comfort, less chance of human back strain, & eliminates the need for a ramp etc. We did have a space issue with no room for a ramp that did make it even more compelling for us.
MJ