Well I have 2 docked dogs running about my house that certainly seem perfectly happy and perfectly healthy as well. They came to me that way, I didn't cut their tails off but I do love this breed and have owned them for 35 years. I guess I am used to the tail less variety of dog. Once they come to me, they are family members, not just pets. They are spoiled like crazy and I doubt they sit around thinking "my life would be more complete, if only I had a tail"
I totally agree with the no docking a horse. I am still confused as to why they need to be docked at all?
I also owned declawed cat (rescues that were done when I got them) none of them had arthritis in their feet. They lived full lives as well. Working in rescue, it was amazing how many cats were dumped for scratching things up in their homes. I am not saying it is right, but I still think that it beats the alternative in many cases. I wish my current cat were declawed. She has destroyed many chairs by jumping on them and sliding down with the claws. She is a nice cat but... claws are not making me happy. I have not tried the glue on nail caps but have heard some bad things about those so... not sure how comfy those are to wear? I do trim her nails every other week. It is amazing how fast those things grow. For now, I just deal with the scratched up pieces of furniture as she limits it to a few (so far) I will likely never get another cat with claws though.