Last Friday we put Advantix 2 on our 1 year old chocolate lab (Cheyenne) and 4 year old golden retriever. The lab has always been a little high strung. But starting Saturday she became obsessed with shadows. She kept looking at the shadows on the ground and running around. Even when we went in the house she was obsessed with the shadows from the lights. She will not settle down. This has been going on for 4 days. Last night she didn't even want to play with any of her toys for staring at the shadows. Is it just a coincidence that this happened after putting the medicine on her or could something else be wrong? This did not affect the golden retriever at all.
Kind of weird and scary at the same time. This is the first time I heard the dog act like that. Have you brought the lab to the vet?