Dog Arthritis Treatment

okay so i have a maltese, shes nine years olds. lately i’ve noticed shes been acting really wierd. all she does is mope around all day. sometimes when i pick her up she’ll yelp reallly loud as if shes in pain. or if im holding her she’ll start growling.(growling for her is normal though she always does that) but then the growl will end in a really loud yelp. im concerned cuz shes usuallly not like this. and a lot of the time during the day or at night she’ll just sit there staring off into space crying. she doesnt really have that many health problems. she does have arthritis in one of her back legs. (i dont remember wich one) but she isnt limping or anything. she does tend to shake her butt a lot when shes walking tho. (it sounds silly but she does). can some please tell me whats wrong with my dog? also, sometimes when we pick her up she also yelps loudly.
my mom tried giving her like a massage to try to see from where her pain is coming from but my dog didnt yelp or anything. and shes not on any medication for her arthritis, when the vet told us she had it he said it wasnt that advance enough to put her on medication at the moment. but that in a couple years she might start limping and that then she might need some. that was a couple years a go. but shes not limping. oh! and for somereason she wont jump onto my bed anymore she just looks at me whith sad eyes like she cant.
help.
thanks!

My mom and I have two dogs who are both on medications. My Chihuahua is on Phenobarbital for epilepsy, and her Rottweiler is on Trimodal for her arthritis. We medicate them at the same time, and my mom accidentally gave her Rottweiler my dogs Phenobarbital. It’s only 16.2 mg, but I’m still concerned.

Will she be ok?

I know, go see a vet, but wondered if anyone had experience or insight…
My lab-mix is an altered rescued female we’ve had for about 6 years. Her guestimated age is 8 or 9.
About three weeks ago she started limping on one leg and had buggery eyes. There was no obvious cause for the limp (no objects in her paw, no obvious area of sensitivity when touched/pressured). About a week later, her eyes cleared up, but her other front leg started hurting. Now, three weeks into it, all four legs are stiff, she thinks long and hard before getting up, has difficulty going down stairs, lays down all day, and no longer gets in the garbage!
Is this just arthritis? I got some doggy aspirin for her, but can’t really tell if it works because she just lays down all the time. She is certainly not herself, and it seemed to happen in a short amount of time.
Thanks in advance!