Would you recommend spaniels as companions? I dream to have a dog to snuggle with and play. Also, due to my disability, some training/tricks could come in handy? Like retrieve something I can't reach, alert when I fall, and maybe help me calm down during panic attacks episodes?
My spaniels are companions, and I think they are the most perfect dog for the job if you like cuddly and playful. We walk together outside, we cuddle inside, they learn and practice tricks, it's perfection to me. I've had a number of excellent cocker companions now, who have all done that job magnificently. Lately my disability has been worse and we have had an extraordinary cocker, who has also been helping me in many ways.
Tristan knows many tricks that help with my various disabilities, like handing me things I drop (and drop again, and drop again... good grief), bringing me stuff I have left out if it's not obviously a dog toy, bringing me named items like the supper dishes, and finding things I have lost. Tristan is a superbly clever boy, probably the only one of our previous cockers who could manage much of what he does, but I expect Gwyn will probably eventually learn a lot of it too.
When we got him, I was looking for a companion, not a helper, but probably if you look you can find someone breeding spaniels who are already known to be steady and extra trainable.
Spaniels are extremely sensitive to handler emotion. I don't doubt that they could recognize panic attacks, but they'll probably need to have a lot of practice in advance to respond when it happens, otherwise they may be too upset by your distress. If you have experience training you may still want to consult with a service dog trainer online or in person for specific task training[*], and if you don't have much experience there's probably a local trainer who can help you get started in-person with a good foundation for helpful tasks and then help you work on expanding.
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Now, having had nothing but good to say so far... my cockers have been very, very clever. And like an intelligent child, if they run out of things to do, they'll find something themselves. Several of Tristan's tricks grew out of redirecting his mischief[**]. For the first few years I spent part of every morning devising puzzles (taping cardboard to a spinner puzzle, stuffing tissue into empty parmesan jars, putting paper towel tubes over sticks and hanging them at nose height) to keep Tristan occupied. Spaniels who get bored will disassemble your house to see if they can.
Tristan is mostly content now to do the helpful tricks he knows, learn more, and practice fun tricks like spin or touch when I have the opportunity to play. I'm going through spaniel puppy again with Gwyn, of course. Today I stuffed large toys tightly into a bucket with a strip of cloth hanging out the side, then tucked the bucket under a chair, so she can squirm in, pull all the toys out, and eventually get the strip of cloth.
There are more easygoing breeds if that doesn't sound doable. That part of spaniel life is understandably not for everyone.