Q. My four month old English springer puppy has a swollen neck /top it does not seem to bother him. It occurred a day after I put flea meds on.
A. Sometimes dogs and cats can have a skin reaction to topical flea and tick medications. Try a different (prescription) brand next time, or switch to an oral medication or one of the new collars. If you want specific recommendations, start a consultation and we can talk about your dog's risk factors. If his current skin condition doesn't go away in a few days or if it starts to bother him, take him to the vet to have it evaluated.