I take meds for sleeping so getting up in the am is usually difficult. My cat will walk up and down on me till I get up. Once I'm up she gets fed and she is fine. I know not truly a service animal, but when she spent a couple of nights at the vets I wasn't up till 11 am. Most service animals are indeed dogs, my parrots will tell me to "take your meds" until I do and give them a treat they will remind me every 15 minutes or so.
The ADA laws were recently changed noting that dogs are only considered service animals. I live in Massachusetts where other species are ok, even pets in training to be service animals are given full rights. For me, life without all of this help would be hell. I recently met a woman who uses a miniature horse as a service animal.