&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.
112 Responses to âSeresto Flea Collar for Dogs Reviewâ. 1  I have been using the Seresto collar on my 12 year old and 3 1/2 year old dogs (Labradors)since June 6th 2013. 2  I started using this flea collar about a month ago and my 5lb Chihuahua is now a very sick dog.