Ok, it's not a dog but it is a big water monitor lizard. I was riding my bike at this park in eastern Bangkok and came across him. It's worse when they are on the bike path like in the pic below. Once I was riding in a paceline near here (Rama IX Park) and one came out on to the track. Brakes were applied pretty d@mn fast to come to a stop. Luckily no one crashed. Would have loved to have seen a video of it!