What is the lump on my dog's stomach It's under the fur not visible until you touch. It's squishy almost fatty. I doesn't seem to cause her any pain. She's not a puppy full adult labterrier mix.?

You should take her in to the veterinarian to be sure that it isn't something serious. It could possibly be a small benign tumor which is not uncommon in dogs and would not hurt her, but you should consult a vet to be sure.