[Counters]
Once Arcanine is in, it must be predicted around. Only the Lati twins resist Arcanine's triple coverage of Fire / Fighting / Electric, so anyone else switching in has to come in on the right move or take severe damage. Once in, strong water, fire or rock moves (none of which, unfortunately for Arcanine, are uncommon) can force it out. If you get Hazards up and keep them there, Arcanine will have a very difficult job, as it will wear itself ou rapidly.
Shouldn't this say "Ground"?