If the dog is a outside dog just being in the sun running and playing also dogs tend to roll on dead frogs.If a indoor dog then it could be that it just needs a bath.They can also smell from playing...
Well its just how they are made
Can you please tell me why my dogs urine has suddenly started to smell like stron ammonia?
This is because urine, particularly very concentrated urine, has a high level of a chemical related to ammonia called ammonium.