LONDON (Reuters) - Britons are mad about animals but really go crackers at Christmas time as stores come up with wacky and downright daft gifts for that special moggy or mutt. British Home Stores is selling dress-up kits for dogs and cats, including the "Moggy Monarch" outfit -- a red velvet cape with white fur trim and a crown for that finishing touch. Other bizarre pet gifts include clip-on antlers, doggy Christmas cakes and mince pies, as well as wreaths made of bone-shaped dog biscuits. But the Royal Society for the Prevention of Cruelty to Animals warns owners against dressing up their pets. "Don't be tempted to dress your pets in fancy dress outfits. They might look like fun but...could seriously injure an animal if the material becomes snagged outdoors," the animal charity said in its Christmas tip sheet.