Possible Clues:

• Like an Old English sheepdog
• Attempt to restrict gag that's rambling, long and coarse
• Scooby-Doo's pal
• Pal of the dogs at 7-Across
• Such a dog may be involved in many dubious accounts
• Woolly type of horse held by S?amus
• Like yaks
• Scooby's buddy
• Hairy, like a bird?
• Funny story about a type of canine