Yes! Our dog is exactly that. We've always told people she's a Jack Daniels . There were two pure white ones in the litter and the rest were marked in patches, like yours. We had a pure white bitch.
She's 9 years old now and I adore her more than any other dog I've ever had, by a long shot. We also have two shelties currently, and they are really lovely, but our JRTx, she's a league apart. I seriously worry about how I will ever cope without her. I'm ridiculously attached. She's SO bright, has excelled at obedience training and agility, has bags of character and absolutely loves every bit of her life with an enthusiasm which is infectious. She's very loyal and adores the whole family. She's the softest dog ever with us and even with my preschool nephew and baby niece I have not a moment's worry. Everything is an adventure to her. She loves walks, rain or shine, day or night. She travels well in the car. Everywhere I go, she's happy to go with me. If I sit and watch TV, she'll curl up by me endlessly. She's affectionate and fun and cute and I get stopped on walks a lot with people admiring her. She feels like a real one-of-kind dog. I can't imagine ever owning a dog who comes close to her.
Now for the warnings! Her character is definitely more terrier than spaniel. She's a bit yappy and has a high prey drive. She got all her obedience awards in a shot at dog training classes, mainly because she is so bright, but would disregard everything she'd learnt in an instant the second we got home if it suited her. She thinks out how to get one up on you constantly - she's learnt to open doors both ways, we have to have child locks on all our cupboards and if she wants something she WILL work out a way to get it. She has been to the vet for poisoning incidents more than once, the most notable of when she pushed furniture in graduated steps to enable her to climb to the top of a bookcase to get some chocolate. We've never found a dog crate she couldn't use her nose and paws simultaneously to get out of. We have to have dog gates on every doorway downstairs and on our bedroom because she sleeps in with us and who knows what she'd get up to if we didn't. We've never found a bin she couldn't get into, however dog proof it claimed to be. She's as soft as anything with people but can be feisty with other dogs, though she's pretty much all noise. Walks are often accompanied by the sight of a live small rodent disappearing down her throat.
In short, she's been hard, hard work and it's only now at age 9 that she's calmed down enough that we have a relatively easy dog. But I wouldn't change any of it for the world. I wouldn't have bred from her as I didn't think it was a responsible thing to do so we got her spayed, but my goodness, a small part of me wishes we'd kept a never ending stream of her descendants as I can't imagine I will ever get a dog as wonderful. I'll find some pics in a moment.