&middotDrought damage - needles gradually turn yellowish-green and then light brown. This starts at the top of the tree and progresses downward and from the outside in. &middotAnimal injury - dog urine can cause some browning and dropping of lower branches on arborvitae and junipers.
There are many different brands of cat flea collars. Generally, flea collars work by either emitting a toxic gas to the local area (head/neck of the pet) or by exuding chemicals that are absorbed into the animal's skin. Some flea collars have an Insect Growth Regulator (IGR), to prevent development of cat fleas, eggs and larvae.
You will have to weigh her to get the right one. Flea collars dont work either! Fleas will reporduce every 10 days so if your dont get them out of your apartment then you have a whole new batch every 10 days. If your apartment is that bad then you need professional help! Wash all the dogs bedding in hot soapy water or just throw it out!