Hey there, welcome to EBN. Chopper is such a sweet baby. I too have a 9 yr old bully - I will tell you that the limping with the weather changes, and good days vs bad days sounds like arthritis. Tyson has it in his back left leg, and its just recently started to really show. We are doing laser therapy, adequan injections, and pain meds as needed. Because he truly does have good and bad days.
He will also sleep about 18-20 hours out of the day, but in all honestly that is a bulldog!
Has the vet done a full panel bloodwork, and xrays? This will tell you alot, in terms of his organs, and whether he has arthritis, etc. I do think its your call only because you are the only one who truly knows your baby. I know that for us Tyson still has time with us. He's still happy, acts normal, etc... he's just really slowed down over the last few years.. just like we do as we age. I can't tell you what to do, but I would maybe start with some tests if you haven't already to kinda see what's going on... then maybe you could find some solutions to help make him more comfortable
Based solely on the things you were describing I would not say that it's his time yet I would say that he's just older and somethings need to be adjusted, just to make him more comfortable. Prime example I had to buy carpet runners to put in the tiled areas of our home just to make it more comfortable for Tyson when he has a bad day with his arthritis ... I also purchased him an orthopedic bed that has weight control of heat to help his joints The other things you described our typical bulldog related things we suffered with allergies with Tyson for most of his life. Do you have your baby on any joint supplements? The lifespan of 8 to 10 years old is not very accurate anymore; being on this forum and doing research lately has shown a lot of bull dogs live into 13 or 14 years old sometimes!! please give your baby a big hug for me!!