Dear Sir,
There were several times where little dogs chase bigger dogs around and the owner thinks it is fun, but if their dog gets attacked it will be a different story.
Just because your dog is little, please respect other dogs and keep it on a leader like you should.
Also, it is against the law to not pick up your dog poo, just because it is little it is still dog poo and should be picked up.
Respect your pets and respect people around you and the local environment.
Name and address supplied.