With the caveat that I cannot afford these types of services currently I would just love to take my two elderly kitties to a animal chiropractor or massage therapist. The both have arthritis to some degree, Spike's seems worse but that is because his medium length hair gets caught on his teeth when he is chewing over joints due to pain. They are both free fed dry kibble that is a senior formula containing Glucosamine and Chondroitin. It seems to work well, at least for Spike who has stopped chewing his joints (and fleas), and let his hair have a chance to grow back.
The only real issue I would have (besides the price tag), is: Hobbes is not a social cat, she is a one person cat, and stress shows every time she goes to the vet, and the few times I took her to the groomer. She is elderly and doesn't deserve getting stressed out just to get the benefit from the therapy - as it would be a wash in the long run. I think Spike might adapt to a warm water soak and swim, but Hobbes, again, was traumatized with water - small child "washed" the young kitties in the only water vessel he could reach - the toilet. So she hates baths, showers or being spritzed with Essential oils mixed with water.
Max has a slight 'hitch in his giddiaup' and having him see a chiropractor or masseuse might help that. Max also has a very long back in proportion to his legs, which makes it difficult for him to sometimes "jump" up on various furniture from the sofa to beds, If he doesn't get the right amount of spring, he ends up slamming his chest against the side of the object he wants to get on top of. That has got to leave a bit if a twist in his spine.
So the short answer is - Yes. If I could afford these services for my pets, I would make use of them, especially as they age. If my pet was to have a traumatic event happen such as a car accident or cancer: again I would have to weigh cost I could afford, vs quality of life vs pain.
When I adopted Spike I promised him that I would keep him as pain free as I could manage, and to make the hard decision should I be in a situation where he has increasing pain and no relief for it. I wanted him to finish out his life with a handler who loved him. He had spent 20 years with his first owner who had to move to a nursing home - and there was no one to take Spike in.
The Vet we have taken family dogs to has expanded over the years and currently has 5 vets, and at one time they had an Eye specialist as part of their roster, Hobbes had her eyes tested for glaucoma by him the first time, and she has been tested in subsequent years to see how her eyes are doing and if I need to use the timoptic again. I had Spike tested when I lived up in Pittsburgh along with Hobbes. I have not been able to afford the yearly vax and check-up, and it rained this weekend when a local rescue in conjunction with Kibblez of Love pet food bank was scheduled to hold an event with $2 rabies shots from 9:30 to 10:30, but it absolutely poured the night before and I had to decide if I was going and arrange a ride - I most slow, and it isn't worth me getting sick.
If I need to take them in before my budget for vet care is full enough then, I will take them all to a local humane society. It is offering for adult dogs, a $55 package with heartworm occult testing and shots;, and includes 6 in 1, Rabies, Distemper, Hepatitis (Adenovirus type 2), Parainfluenza, Parvo, Leptospirosis, Bordatella and deworming. Without the heartworm testing the cost is $45 for all the vaccines and deworming. The Adult Cat package is also $55 for FVRCP (Feline Viral Rhinotracheitis (FVR), Calicivirus, Panleukopenia and Chlamydia), rabies vaccine and deworming.
I just saw on their website that Greenacres and Lake Worth residents can get free spay or neuter (regular cost is $45 for cats, $150 for dogs). I also think Kibblez of Love pet food bank is willing to help people afford to get their pet spayed or neutered.