The Kohler 3943 has a 33" cutout and is designed to fit a 36" cabinet. It's 9" deep which is plenty for dog washing.

Or I can have one built for you at 12" deep for about quadruple the price.

@Joseph Corlett, LLC - The sink I currently have is a laundry sink and it's 12 inches deep. I have seen some at 10 but not 12. I really need the 12 inch deep. I'm not looking for an apron front, but an under mount. I'd be willing to have one made depending on the cost. I'd like the largest one I could fit in a 36 inch cabinet and 12 or 14 inches deep.

OK - I found a Julien brand sink (Canadian brand) that is 31.5 x17x12 in 16 gauge stainless. Fits in a 36 inch cabinet. I think people like this brand. It's $1100 - wish I could find something cheaper to wash the dog in. Could work for me. Any other options?

Julien urban edge undermount stainless steel sink 12-1/2 deep.

Quality Bath

JULIEN undermount utility sink

@taliaferro - Just posted one I found from Julien - I need more that 21 inches wide, but they had one. Thanks.

I also want to share that I decided to pass on the Julien because there was a long lead time and I was worried about the 0mm radius corners. Instead, I purchased a Kohler Glen Falls utility sink which is cast iron and has a depth of 13”. I believe the price was lower as well.

Really use a laundry sink then.

I got this one (or one very similar) 10 inch deep and with the undermounting and countertop I guess it's 11 inches . My point though is that it is really deep. Are you sure that would not work for you?

@salonva Thanks. I had not thought about the depth of the countertop as my current sink is an old over mount. Something 10 inches would only be an inch shallower. Maybe better than spending all the money fir the Julien.

Why not just wash the dog in the bathtub? I put in a hair catcher and either use the showerhead with a long hose or fill the tub a bit and use a large plastic cup to rinse her off.

Waterpik 6 Spray 4 8 in Single Wall Mount Handheld Adjustable Shower Head in Chrome VMH-663ME - The Home Depot

DANCO Bathtub Drain Hair Catcher Snare and Strainer, White, 1-Pack (10306) - Walmart.com - Walmart.com

@kayozzy - Thanks, but that won't work for me. I have a groomer come to the house and I don't want her up in my bathrooms. I also don't want to have to clean a big tub or shower afterwards. Not to mention the bending.

@User - The dog isn't THAT BIG - The 12 inch deep has been working well for years.

Wondering if you have a stainless steel fabricator in your area? Someone who works on commercial kitchens, maybe? That might be the way to go if you can't find the appropriate laundry or kitchen sink.

Ah, that makes sense! They do make some portable dog washing sinks, but I haven't researched them enough to know if they would work in your situation.

I don’t know how big your dog is but I had this LR sink in my last house and it was perfect for my terrier mix. Could kick myself for not getting the same sink. Wanted to save a few bucks. Big mistake.

https://www.us.kohler.com/us/River-Falls-under-mount-utility-sink-with-4-faucet-holes---3-holes-on-deck-on-the-left-and-right-hand-accessory-hole/productDetail/utility-sinks/426363.htm?skuId=400575&brandId=433025