Great place to stay with a dog on the way to or from ferry. Personally, for me the only downside is the beds are too hard, but the owners who run the hotel are really nice, friendly and helpful. We've found it best for us to book a superior double room, as coffee and biscuits provided, but the rooms themselves all seem to be the same good standard with walk in shower, and very firm bed.
Although we don't use it, there is a Clinique Veterinaire right next door so if you stayed for 2 nights you could get your pet sorted there before returning to the UK.
Also a good centre commerciale just down the road with a flunch restaurant for good value meals.
You can get breakfast at the hotel, which is very good, and also order light meals to collect from reception, though there are no vegetarian options.
Plenty of room to exercise the dog, and a good park at plouville nearby, where it can have a good run.
We always stay at this hotel when travelling to France and back via Newhaven/Dieppe ferry.