Keepsmiln1818, I could have written your post. My 9yr old Rott/shepherd mix was diagnosed w/osteosarcoma about 3 weeks ago. She has moderate arthritis (she takes Rimadyl) and a fused lower spine. The 2 weeks it took to get the appointment with the oncologist were the longest of my life. The day we saw him (thursday 2/11) Sadie got her first chemo treatment, and on Sat 2/13 she had her front right leg amputated. Her tumor was actually in her scapula and we thought maybe they could remove the scapula and save her leg, but there was some muscle involvement that made that impossible. I get to bring my baby home in the morning and I can hardly wait. Her chest x-ray was clear and she will have 3 more chemo treatments. I visited her Monday and they asked me not to come back until I took her home (she thought I was going to take her home then and was impossible after I left without her) She has a lot of fight in her which is why I feel I made the right decision. As others have said, you will also make the right decision. My only advice is not to let Henri's age or size make the decision, try to make it based on his (and your) constitution. My thoughts and prayers are with you during this tough time.