A:AnswerDog hair to thick it would hang up or bog down. I Would suggest a simple hair clippers like the Whal color pro plus, hair clippers kit at walmart $24.00 is all you need none of all the more expensive ones. I just bought one about a month ago to replace my old clippers for my self for my dogs and a plus you can touch up a person's beard or head hair.
A:AnswerOn the back of the trimmer there should be a compartment cover that slides down exposing where you change the batteries. If you need more help, please contact Wahl at help@wahlclipper.com or call us at 1-800-729-9245 (USA only) or 1-815-625-6525 (Outside USA).