Hello; Not a dog. A pet hippo. The telling bit for me were the comments made by the hippos owner and the warnings which he ignored. I will assume I will not offend anyone on here as i doubt any have a pet hippo.
I changed all of the steel brake lines and so there was plenty of air in the system and it was difficult to bleed it out. I ended up making this little device out of a medical syringe and some spare fish filter parts.
The little wire spring clip allows me to keep pressure on the system while I go around and open the bleeders. This put about 10 mL into the system each time popping out an equal amount of air and I only had to use this about six times before the system was solid enough to pedal bleed.