What happens to Snowball during the meeting about the windmill?

During the meeting about the windmill, Snowball is attacked by "nine enormous dogs wearing brass-studded collars." These dogs answer only to Napoleon, and they were likely ordered to kill him. However, the dogs could not catch Snowball during the chase and only managed to run him off the farm.
The meeting was held to discuss whether a windmill should be built. For weeks, Snowball had touted the benefits of a windmill, "which could be made to operate a dynamo and supply the farm with electrical power." Snowball proclaimed that once the farm had electricity, the animals could have light and warmth in their stalls during the winter. Electricity would also make the use of a "circular saw, a chaff-cutter, a mangel-slicer, and an electric milking machine" possible.
With the use of time-saving tools, the work on the farm would be far less labor-intensive. The animals would only have to work three days a week. During the meeting, Snowball further expounded on the benefits of the windmill. His passionate discourse inspired the animals to support his windmill initiative. 
Meanwhile, Napoleon became visibly angry at the turn of events. He called up nine ferocious dogs to kill Snowball. However, because of Snowball's agility and speed, none of the dogs could catch him. Essentially, Snowball was chased off the farm.

One of them all but closed his jaws on Snowball’s tail, but Snowball whisked it free just in time. Then he put on an extra spurt and, with a few inches to spare, slipped through a hole in the hedge and was seen no more.