Ultrasonic flea collars
Schwartz, C.
Journal of the American Veterinary Medical Association 196(6): 833-834
1990
ISSN/ISBN: 0003-1488 PMID: 2312375 Document Number: 364253
The experimental procedures of trials reported by M.W. Dryden et al. (1989) that is formed between the animal's neck and the ground", while (b) declawing the cats, together with fitting them with collars and confining them in cages would have caused them stress which "probably affected the results of the study". In reply, the original authors point out that because the ultrasonic collars were fitted caudal to the Elizabethan collars and also because the sides of the cages in which each cat was confined were sound-reflective, any "sound shield" around an animal's body would have been at least as complete as in ordinary use, while stress factors such as those cited would not influence flea responses to a repellent stimulus.